Quizbank/Electricity and Magnetism (calculus based)/c09

calcPhyEMq/c09 ID153287923206 (|Study guide)

Exams:  A0  A1  A2   B0  B1  B2   C0  C1  C2   D0  D1  D2   E0  E1  E2   F0  F1  F2   G0  G1  G2   H0  H1  H2   I0  I1  I2   J0  J1  J2   K0  K1  K2   L0  L1  L2   M0  M1  M2   N0  N1  N2   O0  O1  O2   P0  P1  P2   Q0  Q1  Q2   R0  R1  R2   S0  S1  S2   T0  T1  T2   U0  U1  U2   V0  V1  V2   W0  W1  W2   X0  X1  X2   Y0  Y1  Y2   Z0  Z1  Z2

Answers:  A0  A1  A2   B0  B1  B2   C0  C1  C2   D0  D1  D2   E0  E1  E2   F0  F1  F2   G0  G1  G2   H0  H1  H2   I0  I1  I2   J0  J1  J2   K0  K1  K2   L0  L1  L2   M0  M1  M2   N0  N1  N2   O0  O1  O2   P0  P1  P2   Q0  Q1  Q2   R0  R1  R2   S0  S1  S2   T0  T1  T2   U0  U1  U2   V0  V1  V2   W0  W1  W2   X0  X1  X2   Y0  Y1  Y2   Z0  Z1  Z2

78 Tests = 3 versions x 26 variations: Each of the 26 variations (A, B, ...) represents a different random selection of questions taken from the |study guide.The 3 versions (0,1,..) all have the same questions but in different order and with different numerical inputs. Unless all students take  version "0" it is best to reserve it for the instructor because the questions are grouped according to the order in which they appear on the study guide.

Links:  Quizbank/Instructions   |Study guide    file:Quizbank153287923206.pdf

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c09 A0
1) Imagine a substance could be made into a very hot filament. Suppose the resitance is 3.64 &Omega; at a temperature of 82&deg;C and that the temperature coefficient of expansion is 4.530E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 390 &deg;C?


 * a) 7.532E+00 &Omega;
 * b) 7.908E+00 &Omega;
 * c) 8.303E+00 &Omega;
 * d) 8.719E+00 &Omega;
 * e) 9.155E+00 &Omega;

2) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=27 C  and $$\tau=$$0.0154 s. What is the current at $$t=$$0.0177 s?


 * a) 4.591E+02 A
 * b) 5.050E+02 A
 * c) 5.555E+02 A
 * d) 6.111E+02 A
 * e) 6.722E+02 A

3) Calculate the drift speed of electrons in a copper wire with a diameter of 5.19 mm carrying a 18.2 A current, given that there is one free electron per copper atom. The density of copper is 8.80 x 103kg/m3 and the atomic mass of copper is 63.54 g/mol. Avagadro's number is 6.02 x 1023atoms/mol.


 * a) 5.321E-05 m/s
 * b) 5.853E-05 m/s
 * c) 6.439E-05 m/s
 * d) 7.083E-05 m/s
 * e) 7.791E-05 m/s

4) Calculate the resistance of a 12-gauge copper wire that is 81 m long and carries a current of 32 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 3.737E-01 &Omega;
 * b) 4.111E-01 &Omega;
 * c) 4.522E-01 &Omega;
 * d) 4.975E-01 &Omega;
 * e) 5.472E-01 &Omega;

c09 A1
1) Imagine a substance could be made into a very hot filament. Suppose the resitance is 2.89 &Omega; at a temperature of 89&deg;C and that the temperature coefficient of expansion is 5.340E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 566 &deg;C?


 * a) 9.763E+00 &Omega;
 * b) 1.025E+01 &Omega;
 * c) 1.076E+01 &Omega;
 * d) 1.130E+01 &Omega;
 * e) 1.187E+01 &Omega;

2) Calculate the resistance of a 12-gauge copper wire that is 90 m long and carries a current of 34 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 3.432E-01 &Omega;
 * b) 3.775E-01 &Omega;
 * c) 4.153E-01 &Omega;
 * d) 4.568E-01 &Omega;
 * e) 5.025E-01 &Omega;

3) Calculate the drift speed of electrons in a copper wire with a diameter of 4.38 mm carrying a 5.79 A current, given that there is one free electron per copper atom. The density of copper is 8.80 x 103kg/m3 and the atomic mass of copper is 63.54 g/mol. Avagadro's number is 6.02 x 1023atoms/mol.


 * a) 2.615E-05 m/s
 * b) 2.876E-05 m/s
 * c) 3.164E-05 m/s
 * d) 3.480E-05 m/s
 * e) 3.828E-05 m/s

4) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=91 C  and $$\tau=$$0.0156 s. What is the current at $$t=$$0.0131 s?


 * a) 2.082E+03 A
 * b) 2.290E+03 A
 * c) 2.519E+03 A
 * d) 2.771E+03 A
 * e) 3.048E+03 A

c09 A2
1) Imagine a substance could be made into a very hot filament. Suppose the resitance is 6.74 &Omega; at a temperature of 89&deg;C and that the temperature coefficient of expansion is 4.990E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 366 &deg;C?


 * a) 1.529E+01 &Omega;
 * b) 1.606E+01 &Omega;
 * c) 1.686E+01 &Omega;
 * d) 1.770E+01 &Omega;
 * e) 1.859E+01 &Omega;

2) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=58 C  and $$\tau=$$0.0249 s. What is the current at $$t=$$0.0191 s?


 * a) 8.127E+02 A
 * b) 8.939E+02 A
 * c) 9.833E+02 A
 * d) 1.082E+03 A
 * e) 1.190E+03 A

3) Calculate the drift speed of electrons in a copper wire with a diameter of 5.82 mm carrying a 9.11 A current, given that there is one free electron per copper atom. The density of copper is 8.80 x 103kg/m3 and the atomic mass of copper is 63.54 g/mol. Avagadro's number is 6.02 x 1023atoms/mol.


 * a) 1.926E-05 m/s
 * b) 2.118E-05 m/s
 * c) 2.330E-05 m/s
 * d) 2.563E-05 m/s
 * e) 2.819E-05 m/s

4) Calculate the resistance of a 12-gauge copper wire that is 52 m long and carries a current of 99 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 1.983E-01 &Omega;
 * b) 2.181E-01 &Omega;
 * c) 2.399E-01 &Omega;
 * d) 2.639E-01 &Omega;
 * e) 2.903E-01 &Omega;

c09 B0
1) A make-believe metal has a density of 1.050E+04 kg/m3 and an atomic mass of 58.8 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * a) 1.075E+29 e&minus;/m3
 * b) 1.183E+29 e&minus;/m3
 * c) 1.301E+29 e&minus;/m3
 * d) 1.431E+29 e&minus;/m3
 * e) 1.574E+29 e&minus;/m3

2) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=42 C  and $$\tau=$$0.0166 s. What is the current at $$t=$$0.0156 s?


 * a) 9.886E+02 A
 * b) 1.087E+03 A
 * c) 1.196E+03 A
 * d) 1.316E+03 A
 * e) 1.447E+03 A

3) A device requires consumes 176 W of power and requires 11.9 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * a) 2.262E+06 A/m2
 * b) 2.489E+06 A/m2
 * c) 2.737E+06 A/m2
 * d) 3.011E+06 A/m2
 * e) 3.312E+06 A/m2

4) Calculate the electric field in a 12-gauge copper wire that is 13 m long and carries a current of 59 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 2.250E-04 V/m
 * b) 2.475E-04 V/m
 * c) 2.722E-04 V/m
 * d) 2.995E-04 V/m
 * e) 3.294E-04 V/m

c09 B1
1) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=97 C  and $$\tau=$$0.0132 s. What is the current at $$t=$$0.0225 s?


 * a) 1.336E+03 A
 * b) 1.470E+03 A
 * c) 1.617E+03 A
 * d) 1.779E+03 A
 * e) 1.957E+03 A

2) A make-believe metal has a density of 1.480E+04 kg/m3 and an atomic mass of 73.3 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * a) 1.105E+29 e&minus;/m3
 * b) 1.215E+29 e&minus;/m3
 * c) 1.337E+29 e&minus;/m3
 * d) 1.471E+29 e&minus;/m3
 * e) 1.618E+29 e&minus;/m3

3) Calculate the electric field in a 12-gauge copper wire that is 64 m long and carries a current of 76 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 2.635E-04 V/m
 * b) 2.898E-04 V/m
 * c) 3.188E-04 V/m
 * d) 3.507E-04 V/m
 * e) 3.857E-04 V/m

4) A device requires consumes 126 W of power and requires 1.11 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * a) 2.110E+05 A/m2
 * b) 2.321E+05 A/m2
 * c) 2.553E+05 A/m2
 * d) 2.809E+05 A/m2
 * e) 3.090E+05 A/m2

c09 B2
1) A device requires consumes 142 W of power and requires 12.1 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * a) 2.300E+06 A/m2
 * b) 2.530E+06 A/m2
 * c) 2.783E+06 A/m2
 * d) 3.062E+06 A/m2
 * e) 3.368E+06 A/m2

2) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=30 C  and $$\tau=$$0.0178 s. What is the current at $$t=$$0.0161 s?


 * a) 5.125E+02 A
 * b) 5.638E+02 A
 * c) 6.201E+02 A
 * d) 6.822E+02 A
 * e) 7.504E+02 A

3) A make-believe metal has a density of 1.300E+04 kg/m3 and an atomic mass of 75.7 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * a) 9.398E+28 e&minus;/m3
 * b) 1.034E+29 e&minus;/m3
 * c) 1.137E+29 e&minus;/m3
 * d) 1.251E+29 e&minus;/m3
 * e) 1.376E+29 e&minus;/m3

4) Calculate the electric field in a 12-gauge copper wire that is 15 m long and carries a current of 85 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 2.947E-04 V/m
 * b) 3.241E-04 V/m
 * c) 3.565E-04 V/m
 * d) 3.922E-04 V/m
 * e) 4.314E-04 V/m

c09 C0
1) Imagine a substance could be made into a very hot filament. Suppose the resitance is 6.06 &Omega; at a temperature of 80&deg;C and that the temperature coefficient of expansion is 4.290E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 330 &deg;C?


 * a) 1.196E+01 &Omega;
 * b) 1.256E+01 &Omega;
 * c) 1.319E+01 &Omega;
 * d) 1.385E+01 &Omega;
 * e) 1.454E+01 &Omega;

2) A make-believe metal has a density of 1.050E+04 kg/m3 and an atomic mass of 58.8 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * a) 1.075E+29 e&minus;/m3
 * b) 1.183E+29 e&minus;/m3
 * c) 1.301E+29 e&minus;/m3
 * d) 1.431E+29 e&minus;/m3
 * e) 1.574E+29 e&minus;/m3

3) Calculate the resistance of a 12-gauge copper wire that is 86 m long and carries a current of 97 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 4.365E-01 &Omega;
 * b) 4.801E-01 &Omega;
 * c) 5.282E-01 &Omega;
 * d) 5.810E-01 &Omega;
 * e) 6.391E-01 &Omega;

4) Calculate the drift speed of electrons in a copper wire with a diameter of 5.33 mm carrying a 5.1 A current, given that there is one free electron per copper atom. The density of copper is 8.80 x 103kg/m3 and the atomic mass of copper is 63.54 g/mol. Avagadro's number is 6.02 x 1023atoms/mol.


 * a) 1.711E-05 m/s
 * b) 1.882E-05 m/s
 * c) 2.070E-05 m/s
 * d) 2.277E-05 m/s
 * e) 2.505E-05 m/s

c09 C1
1) Imagine a substance could be made into a very hot filament. Suppose the resitance is 6.06 &Omega; at a temperature of 80&deg;C and that the temperature coefficient of expansion is 4.290E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 330 &deg;C?


 * a) 1.196E+01 &Omega;
 * b) 1.256E+01 &Omega;
 * c) 1.319E+01 &Omega;
 * d) 1.385E+01 &Omega;
 * e) 1.454E+01 &Omega;

2) A make-believe metal has a density of 1.300E+04 kg/m3 and an atomic mass of 75.7 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * a) 9.398E+28 e&minus;/m3
 * b) 1.034E+29 e&minus;/m3
 * c) 1.137E+29 e&minus;/m3
 * d) 1.251E+29 e&minus;/m3
 * e) 1.376E+29 e&minus;/m3

3) Calculate the drift speed of electrons in a copper wire with a diameter of 2.72 mm carrying a 16.2 A current, given that there is one free electron per copper atom. The density of copper is 8.80 x 103kg/m3 and the atomic mass of copper is 63.54 g/mol. Avagadro's number is 6.02 x 1023atoms/mol.


 * a) 2.087E-04 m/s
 * b) 2.295E-04 m/s
 * c) 2.525E-04 m/s
 * d) 2.777E-04 m/s
 * e) 3.055E-04 m/s

4) Calculate the resistance of a 12-gauge copper wire that is 19 m long and carries a current of 59 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 7.970E-02 &Omega;
 * b) 8.767E-02 &Omega;
 * c) 9.644E-02 &Omega;
 * d) 1.061E-01 &Omega;
 * e) 1.167E-01 &Omega;

c09 C2
1) A make-believe metal has a density of 1.180E+04 kg/m3 and an atomic mass of 121.0 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * a) 4.010E+28 e&minus;/m3
 * b) 4.411E+28 e&minus;/m3
 * c) 4.852E+28 e&minus;/m3
 * d) 5.337E+28 e&minus;/m3
 * e) 5.871E+28 e&minus;/m3

2) Calculate the resistance of a 12-gauge copper wire that is 14 m long and carries a current of 38 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 5.873E-02 &Omega;
 * b) 6.460E-02 &Omega;
 * c) 7.106E-02 &Omega;
 * d) 7.816E-02 &Omega;
 * e) 8.598E-02 &Omega;

3) Calculate the drift speed of electrons in a copper wire with a diameter of 3.33 mm carrying a 13.8 A current, given that there is one free electron per copper atom. The density of copper is 8.80 x 103kg/m3 and the atomic mass of copper is 63.54 g/mol. Avagadro's number is 6.02 x 1023atoms/mol.


 * a) 8.910E-05 m/s
 * b) 9.801E-05 m/s
 * c) 1.078E-04 m/s
 * d) 1.186E-04 m/s
 * e) 1.305E-04 m/s

4) Imagine a substance could be made into a very hot filament. Suppose the resitance is 1.95 &Omega; at a temperature of 96&deg;C and that the temperature coefficient of expansion is 4.400E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 469 &deg;C?


 * a) 4.449E+00 &Omega;
 * b) 4.672E+00 &Omega;
 * c) 4.905E+00 &Omega;
 * d) 5.150E+00 &Omega;
 * e) 5.408E+00 &Omega;

c09 D0
1) A device requires consumes 88 W of power and requires 11.3 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * a) 1.467E+06 A/m2
 * b) 1.614E+06 A/m2
 * c) 1.775E+06 A/m2
 * d) 1.953E+06 A/m2
 * e) 2.148E+06 A/m2

2) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=30 C  and $$\tau=$$0.0178 s. What is the current at $$t=$$0.0161 s?


 * a) 5.125E+02 A
 * b) 5.638E+02 A
 * c) 6.201E+02 A
 * d) 6.822E+02 A
 * e) 7.504E+02 A

3) A make-believe metal has a density of 1.050E+04 kg/m3 and an atomic mass of 58.8 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * a) 1.075E+29 e&minus;/m3
 * b) 1.183E+29 e&minus;/m3
 * c) 1.301E+29 e&minus;/m3
 * d) 1.431E+29 e&minus;/m3
 * e) 1.574E+29 e&minus;/m3

4) What is the average current involved when a truck battery sets in motion 572 C of charge in 3.33 s while starting an engine?


 * a) 1.173E+02 A
 * b) 1.291E+02 A
 * c) 1.420E+02 A
 * d) 1.562E+02 A
 * e) 1.718E+02 A

c09 D1
1) What is the average current involved when a truck battery sets in motion 760 C of charge in 5.35 s while starting an engine?


 * a) 1.291E+02 A
 * b) 1.421E+02 A
 * c) 1.563E+02 A
 * d) 1.719E+02 A
 * e) 1.891E+02 A

2) A make-believe metal has a density of 1.050E+04 kg/m3 and an atomic mass of 58.8 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * a) 1.075E+29 e&minus;/m3
 * b) 1.183E+29 e&minus;/m3
 * c) 1.301E+29 e&minus;/m3
 * d) 1.431E+29 e&minus;/m3
 * e) 1.574E+29 e&minus;/m3

3) A device requires consumes 73 W of power and requires 9.14 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * a) 1.187E+06 A/m2
 * b) 1.306E+06 A/m2
 * c) 1.436E+06 A/m2
 * d) 1.580E+06 A/m2
 * e) 1.738E+06 A/m2

4) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=30 C  and $$\tau=$$0.0178 s. What is the current at $$t=$$0.0161 s?


 * a) 5.125E+02 A
 * b) 5.638E+02 A
 * c) 6.201E+02 A
 * d) 6.822E+02 A
 * e) 7.504E+02 A

c09 D2
1) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=27 C  and $$\tau=$$0.0154 s. What is the current at $$t=$$0.0177 s?


 * a) 4.591E+02 A
 * b) 5.050E+02 A
 * c) 5.555E+02 A
 * d) 6.111E+02 A
 * e) 6.722E+02 A

2) What is the average current involved when a truck battery sets in motion 659 C of charge in 5.48 s while starting an engine?


 * a) 8.214E+01 A
 * b) 9.035E+01 A
 * c) 9.938E+01 A
 * d) 1.093E+02 A
 * e) 1.203E+02 A

3) A make-believe metal has a density of 8.690E+03 kg/m3 and an atomic mass of 48.4 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * a) 1.081E+29 e&minus;/m3
 * b) 1.189E+29 e&minus;/m3
 * c) 1.308E+29 e&minus;/m3
 * d) 1.439E+29 e&minus;/m3
 * e) 1.582E+29 e&minus;/m3

4) A device requires consumes 196 W of power and requires 2.4 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * a) 4.563E+05 A/m2
 * b) 5.019E+05 A/m2
 * c) 5.521E+05 A/m2
 * d) 6.073E+05 A/m2
 * e) 6.680E+05 A/m2

c09 E0
1) A DC winch moter draws 29 amps at 153 volts as it lifts a 4.780E+03 N weight at a constant speed of 0.691 m/s. Assuming that all the electrical power is either converted into gravitational potential energy or ohmically heats the motor's coils, calculate the coil's resistance.


 * a) 1.226E+00 &Omega;
 * b) 1.348E+00 &Omega;
 * c) 1.483E+00 &Omega;
 * d) 1.632E+00 &Omega;
 * e) 1.795E+00 &Omega;

2) What is consumer cost to operate one 76&minus;W incandescent bulb for 9 hours per day for 1 year (365 days) if the cost of electricity is $0.144 per kilowatt-hour?


 * a) $3.595E+01
 * b) $3.955E+01
 * c) $4.350E+01
 * d) $4.785E+01
 * e) $5.264E+01

3) A device requires consumes 156 W of power and requires 5.42 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * a) 7.742E+05 A/m2
 * b) 8.516E+05 A/m2
 * c) 9.367E+05 A/m2
 * d) 1.030E+06 A/m2
 * e) 1.133E+06 A/m2

4) Calculate the electric field in a 12-gauge copper wire that is 48 m long and carries a current of 63 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 3.198E-04 V/m
 * b) 3.517E-04 V/m
 * c) 3.869E-04 V/m
 * d) 4.256E-04 V/m
 * e) 4.682E-04 V/m

c09 E1
1) What is consumer cost to operate one 74&minus;W incandescent bulb for 9 hours per day for 1 year (365 days) if the cost of electricity is $0.119 per kilowatt-hour?


 * a) $1.976E+01
 * b) $2.173E+01
 * c) $2.391E+01
 * d) $2.630E+01
 * e) $2.893E+01

2) A device requires consumes 166 W of power and requires 9.99 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * a) 1.570E+06 A/m2
 * b) 1.727E+06 A/m2
 * c) 1.899E+06 A/m2
 * d) 2.089E+06 A/m2
 * e) 2.298E+06 A/m2

3) A DC winch moter draws 17 amps at 187 volts as it lifts a 5.600E+03 N weight at a constant speed of 0.381 m/s. Assuming that all the electrical power is either converted into gravitational potential energy or ohmically heats the motor's coils, calculate the coil's resistance.


 * a) 2.471E+00 &Omega;
 * b) 2.718E+00 &Omega;
 * c) 2.990E+00 &Omega;
 * d) 3.288E+00 &Omega;
 * e) 3.617E+00 &Omega;

4) Calculate the electric field in a 12-gauge copper wire that is 78 m long and carries a current of 24 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 1.218E-04 V/m
 * b) 1.340E-04 V/m
 * c) 1.474E-04 V/m
 * d) 1.621E-04 V/m
 * e) 1.783E-04 V/m

c09 E2
1) A device requires consumes 166 W of power and requires 9.99 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * a) 1.570E+06 A/m2
 * b) 1.727E+06 A/m2
 * c) 1.899E+06 A/m2
 * d) 2.089E+06 A/m2
 * e) 2.298E+06 A/m2

2) What is consumer cost to operate one 102&minus;W incandescent bulb for 6 hours per day for 1 year (365 days) if the cost of electricity is $0.127 per kilowatt-hour?


 * a) $2.131E+01
 * b) $2.345E+01
 * c) $2.579E+01
 * d) $2.837E+01
 * e) $3.121E+01

3) A DC winch moter draws 27 amps at 143 volts as it lifts a 5.060E+03 N weight at a constant speed of 0.623 m/s. Assuming that all the electrical power is either converted into gravitational potential energy or ohmically heats the motor's coils, calculate the coil's resistance.


 * a) 8.033E-01 &Omega;
 * b) 8.837E-01 &Omega;
 * c) 9.720E-01 &Omega;
 * d) 1.069E+00 &Omega;
 * e) 1.176E+00 &Omega;

4) Calculate the electric field in a 12-gauge copper wire that is 18 m long and carries a current of 22 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 1.117E-04 V/m
 * b) 1.228E-04 V/m
 * c) 1.351E-04 V/m
 * d) 1.486E-04 V/m
 * e) 1.635E-04 V/m

c09 F0
1) What is the average current involved when a truck battery sets in motion 682 C of charge in 5.29 s while starting an engine?


 * a) 1.065E+02 A
 * b) 1.172E+02 A
 * c) 1.289E+02 A
 * d) 1.418E+02 A
 * e) 1.560E+02 A

2) A device requires consumes 185 W of power and requires 10.1 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * a) 1.920E+06 A/m2
 * b) 2.112E+06 A/m2
 * c) 2.323E+06 A/m2
 * d) 2.556E+06 A/m2
 * e) 2.811E+06 A/m2

3) Calculate the resistance of a 12-gauge copper wire that is 48 m long and carries a current of 50 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 2.215E-01 &Omega;
 * b) 2.436E-01 &Omega;
 * c) 2.680E-01 &Omega;
 * d) 2.948E-01 &Omega;
 * e) 3.243E-01 &Omega;

4) A make-believe metal has a density of 1.300E+04 kg/m3 and an atomic mass of 75.7 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * a) 9.398E+28 e&minus;/m3
 * b) 1.034E+29 e&minus;/m3
 * c) 1.137E+29 e&minus;/m3
 * d) 1.251E+29 e&minus;/m3
 * e) 1.376E+29 e&minus;/m3

c09 F1
1) Calculate the resistance of a 12-gauge copper wire that is 69 m long and carries a current of 98 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 2.631E-01 &Omega;
 * b) 2.894E-01 &Omega;
 * c) 3.184E-01 &Omega;
 * d) 3.502E-01 &Omega;
 * e) 3.852E-01 &Omega;

2) A make-believe metal has a density of 3.530E+03 kg/m3 and an atomic mass of 10.5 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * a) 1.673E+29 e&minus;/m3
 * b) 1.840E+29 e&minus;/m3
 * c) 2.024E+29 e&minus;/m3
 * d) 2.226E+29 e&minus;/m3
 * e) 2.449E+29 e&minus;/m3

3) What is the average current involved when a truck battery sets in motion 728 C of charge in 3.94 s while starting an engine?


 * a) 1.848E+02 A
 * b) 2.032E+02 A
 * c) 2.236E+02 A
 * d) 2.459E+02 A
 * e) 2.705E+02 A

4) A device requires consumes 177 W of power and requires 6.82 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * a) 9.741E+05 A/m2
 * b) 1.072E+06 A/m2
 * c) 1.179E+06 A/m2
 * d) 1.297E+06 A/m2
 * e) 1.426E+06 A/m2

c09 F2
1) A make-believe metal has a density of 3.470E+03 kg/m3 and an atomic mass of 33.8 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * a) 6.180E+28 e&minus;/m3
 * b) 6.798E+28 e&minus;/m3
 * c) 7.478E+28 e&minus;/m3
 * d) 8.226E+28 e&minus;/m3
 * e) 9.049E+28 e&minus;/m3

2) Calculate the resistance of a 12-gauge copper wire that is 14 m long and carries a current of 38 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 5.873E-02 &Omega;
 * b) 6.460E-02 &Omega;
 * c) 7.106E-02 &Omega;
 * d) 7.816E-02 &Omega;
 * e) 8.598E-02 &Omega;

3) What is the average current involved when a truck battery sets in motion 618 C of charge in 2.28 s while starting an engine?


 * a) 2.240E+02 A
 * b) 2.464E+02 A
 * c) 2.711E+02 A
 * d) 2.982E+02 A
 * e) 3.280E+02 A

4) A device requires consumes 103 W of power and requires 6.3 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * a) 8.999E+05 A/m2
 * b) 9.899E+05 A/m2
 * c) 1.089E+06 A/m2
 * d) 1.198E+06 A/m2
 * e) 1.317E+06 A/m2

c09 G0
1) A make-believe metal has a density of 1.480E+04 kg/m3 and an atomic mass of 196.0 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * a) 4.546E+28 e&minus;/m3
 * b) 5.000E+28 e&minus;/m3
 * c) 5.500E+28 e&minus;/m3
 * d) 6.050E+28 e&minus;/m3
 * e) 6.655E+28 e&minus;/m3

2) Calculate the electric field in a 12-gauge copper wire that is 99 m long and carries a current of 71 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 3.604E-04 V/m
 * b) 3.964E-04 V/m
 * c) 4.360E-04 V/m
 * d) 4.796E-04 V/m
 * e) 5.276E-04 V/m

3) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=42 C  and $$\tau=$$0.0166 s. What is the current at $$t=$$0.0156 s?


 * a) 9.886E+02 A
 * b) 1.087E+03 A
 * c) 1.196E+03 A
 * d) 1.316E+03 A
 * e) 1.447E+03 A

4) A DC winch moter draws 23 amps at 170 volts as it lifts a 5.200E+03 N weight at a constant speed of 0.662 m/s. Assuming that all the electrical power is either converted into gravitational potential energy or ohmically heats the motor's coils, calculate the coil's resistance.


 * a) 7.305E-01 &Omega;
 * b) 8.036E-01 &Omega;
 * c) 8.839E-01 &Omega;
 * d) 9.723E-01 &Omega;
 * e) 1.070E+00 &Omega;

c09 G1
1) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=24 C  and $$\tau=$$0.0248 s. What is the current at $$t=$$0.0122 s?


 * a) 4.042E+02 A
 * b) 4.446E+02 A
 * c) 4.890E+02 A
 * d) 5.379E+02 A
 * e) 5.917E+02 A

2) Calculate the electric field in a 12-gauge copper wire that is 18 m long and carries a current of 22 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 1.117E-04 V/m
 * b) 1.228E-04 V/m
 * c) 1.351E-04 V/m
 * d) 1.486E-04 V/m
 * e) 1.635E-04 V/m

3) A make-believe metal has a density of 1.580E+04 kg/m3 and an atomic mass of 41.5 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * a) 2.292E+29 e&minus;/m3
 * b) 2.521E+29 e&minus;/m3
 * c) 2.773E+29 e&minus;/m3
 * d) 3.051E+29 e&minus;/m3
 * e) 3.356E+29 e&minus;/m3

4) A DC winch moter draws 13 amps at 159 volts as it lifts a 4.270E+03 N weight at a constant speed of 0.357 m/s. Assuming that all the electrical power is either converted into gravitational potential energy or ohmically heats the motor's coils, calculate the coil's resistance.


 * a) 3.211E+00 &Omega;
 * b) 3.532E+00 &Omega;
 * c) 3.885E+00 &Omega;
 * d) 4.273E+00 &Omega;
 * e) 4.701E+00 &Omega;

c09 G2
1) Calculate the electric field in a 12-gauge copper wire that is 25 m long and carries a current of 43 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 2.182E-04 V/m
 * b) 2.401E-04 V/m
 * c) 2.641E-04 V/m
 * d) 2.905E-04 V/m
 * e) 3.195E-04 V/m

2) A DC winch moter draws 18 amps at 126 volts as it lifts a 5.830E+03 N weight at a constant speed of 0.26 m/s. Assuming that all the electrical power is either converted into gravitational potential energy or ohmically heats the motor's coils, calculate the coil's resistance.


 * a) 1.919E+00 &Omega;
 * b) 2.111E+00 &Omega;
 * c) 2.322E+00 &Omega;
 * d) 2.554E+00 &Omega;
 * e) 2.809E+00 &Omega;

3) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=91 C  and $$\tau=$$0.0156 s. What is the current at $$t=$$0.0131 s?


 * a) 2.082E+03 A
 * b) 2.290E+03 A
 * c) 2.519E+03 A
 * d) 2.771E+03 A
 * e) 3.048E+03 A

4) A make-believe metal has a density of 1.480E+04 kg/m3 and an atomic mass of 73.3 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * a) 1.105E+29 e&minus;/m3
 * b) 1.215E+29 e&minus;/m3
 * c) 1.337E+29 e&minus;/m3
 * d) 1.471E+29 e&minus;/m3
 * e) 1.618E+29 e&minus;/m3

c09 H0
1) A make-believe metal has a density of 1.050E+04 kg/m3 and an atomic mass of 58.8 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * a) 1.075E+29 e&minus;/m3
 * b) 1.183E+29 e&minus;/m3
 * c) 1.301E+29 e&minus;/m3
 * d) 1.431E+29 e&minus;/m3
 * e) 1.574E+29 e&minus;/m3

2) Calculate the electric field in a 12-gauge copper wire that is 48 m long and carries a current of 63 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 3.198E-04 V/m
 * b) 3.517E-04 V/m
 * c) 3.869E-04 V/m
 * d) 4.256E-04 V/m
 * e) 4.682E-04 V/m

3) A device requires consumes 72 W of power and requires 11.7 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * a) 1.519E+06 A/m2
 * b) 1.671E+06 A/m2
 * c) 1.838E+06 A/m2
 * d) 2.022E+06 A/m2
 * e) 2.224E+06 A/m2

4) A DC winch moter draws 20 amps at 157 volts as it lifts a 5.270E+03 N weight at a constant speed of 0.403 m/s. Assuming that all the electrical power is either converted into gravitational potential energy or ohmically heats the motor's coils, calculate the coil's resistance.


 * a) 2.540E+00 &Omega;
 * b) 2.795E+00 &Omega;
 * c) 3.074E+00 &Omega;
 * d) 3.381E+00 &Omega;
 * e) 3.720E+00 &Omega;

c09 H1
1) A make-believe metal has a density of 5.880E+03 kg/m3 and an atomic mass of 87.4 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * a) 3.347E+28 e&minus;/m3
 * b) 3.682E+28 e&minus;/m3
 * c) 4.050E+28 e&minus;/m3
 * d) 4.455E+28 e&minus;/m3
 * e) 4.901E+28 e&minus;/m3

2) Calculate the electric field in a 12-gauge copper wire that is 23 m long and carries a current of 64 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 2.953E-04 V/m
 * b) 3.248E-04 V/m
 * c) 3.573E-04 V/m
 * d) 3.930E-04 V/m
 * e) 4.324E-04 V/m

3) A device requires consumes 84 W of power and requires 3.66 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * a) 5.751E+05 A/m2
 * b) 6.326E+05 A/m2
 * c) 6.958E+05 A/m2
 * d) 7.654E+05 A/m2
 * e) 8.419E+05 A/m2

4) A DC winch moter draws 25 amps at 128 volts as it lifts a 5.710E+03 N weight at a constant speed of 0.449 m/s. Assuming that all the electrical power is either converted into gravitational potential energy or ohmically heats the motor's coils, calculate the coil's resistance.


 * a) 8.413E-01 &Omega;
 * b) 9.254E-01 &Omega;
 * c) 1.018E+00 &Omega;
 * d) 1.120E+00 &Omega;
 * e) 1.232E+00 &Omega;

c09 H2
1) A DC winch moter draws 24 amps at 159 volts as it lifts a 4.120E+03 N weight at a constant speed of 0.657 m/s. Assuming that all the electrical power is either converted into gravitational potential energy or ohmically heats the motor's coils, calculate the coil's resistance.


 * a) 1.447E+00 &Omega;
 * b) 1.591E+00 &Omega;
 * c) 1.751E+00 &Omega;
 * d) 1.926E+00 &Omega;
 * e) 2.118E+00 &Omega;

2) A device requires consumes 81 W of power and requires 2.34 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * a) 3.342E+05 A/m2
 * b) 3.677E+05 A/m2
 * c) 4.044E+05 A/m2
 * d) 4.449E+05 A/m2
 * e) 4.894E+05 A/m2

3) A make-believe metal has a density of 1.180E+04 kg/m3 and an atomic mass of 121.0 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * a) 4.010E+28 e&minus;/m3
 * b) 4.411E+28 e&minus;/m3
 * c) 4.852E+28 e&minus;/m3
 * d) 5.337E+28 e&minus;/m3
 * e) 5.871E+28 e&minus;/m3

4) Calculate the electric field in a 12-gauge copper wire that is 99 m long and carries a current of 71 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 3.604E-04 V/m
 * b) 3.964E-04 V/m
 * c) 4.360E-04 V/m
 * d) 4.796E-04 V/m
 * e) 5.276E-04 V/m

c09 I0
1) What is consumer cost to operate one 87&minus;W incandescent bulb for 11 hours per day for 1 year (365 days) if the cost of electricity is $0.117 per kilowatt-hour?


 * a) $2.791E+01
 * b) $3.071E+01
 * c) $3.378E+01
 * d) $3.715E+01
 * e) $4.087E+01

2) Calculate the electric field in a 12-gauge copper wire that is 16 m long and carries a current of 58 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 2.212E-04 V/m
 * b) 2.433E-04 V/m
 * c) 2.676E-04 V/m
 * d) 2.944E-04 V/m
 * e) 3.238E-04 V/m

3) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=85 C  and $$\tau=$$0.021 s. What is the current at $$t=$$0.0128 s?


 * a) 1.503E+03 A
 * b) 1.653E+03 A
 * c) 1.818E+03 A
 * d) 2.000E+03 A
 * e) 2.200E+03 A

4) Imagine a substance could be made into a very hot filament. Suppose the resitance is 4.08 &Omega; at a temperature of 26&deg;C and that the temperature coefficient of expansion is 4.800E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 388 &deg;C?


 * a) 1.064E+01 &Omega;
 * b) 1.117E+01 &Omega;
 * c) 1.173E+01 &Omega;
 * d) 1.231E+01 &Omega;
 * e) 1.293E+01 &Omega;

c09 I1
1) Imagine a substance could be made into a very hot filament. Suppose the resitance is 6.06 &Omega; at a temperature of 80&deg;C and that the temperature coefficient of expansion is 4.290E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 330 &deg;C?


 * a) 1.196E+01 &Omega;
 * b) 1.256E+01 &Omega;
 * c) 1.319E+01 &Omega;
 * d) 1.385E+01 &Omega;
 * e) 1.454E+01 &Omega;

2) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=63 C  and $$\tau=$$0.0149 s. What is the current at $$t=$$0.0172 s?


 * a) 1.212E+03 A
 * b) 1.333E+03 A
 * c) 1.466E+03 A
 * d) 1.613E+03 A
 * e) 1.774E+03 A

3) What is consumer cost to operate one 102&minus;W incandescent bulb for 6 hours per day for 1 year (365 days) if the cost of electricity is $0.127 per kilowatt-hour?


 * a) $2.131E+01
 * b) $2.345E+01
 * c) $2.579E+01
 * d) $2.837E+01
 * e) $3.121E+01

4) Calculate the electric field in a 12-gauge copper wire that is 62 m long and carries a current of 52 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 1.983E-04 V/m
 * b) 2.181E-04 V/m
 * c) 2.399E-04 V/m
 * d) 2.639E-04 V/m
 * e) 2.903E-04 V/m

c09 I2
1) Imagine a substance could be made into a very hot filament. Suppose the resitance is 6.74 &Omega; at a temperature of 89&deg;C and that the temperature coefficient of expansion is 4.990E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 366 &deg;C?


 * a) 1.529E+01 &Omega;
 * b) 1.606E+01 &Omega;
 * c) 1.686E+01 &Omega;
 * d) 1.770E+01 &Omega;
 * e) 1.859E+01 &Omega;

2) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=18 C  and $$\tau=$$0.0169 s. What is the current at $$t=$$0.0137 s?


 * a) 3.913E+02 A
 * b) 4.305E+02 A
 * c) 4.735E+02 A
 * d) 5.209E+02 A
 * e) 5.729E+02 A

3) What is consumer cost to operate one 74&minus;W incandescent bulb for 9 hours per day for 1 year (365 days) if the cost of electricity is $0.119 per kilowatt-hour?


 * a) $1.976E+01
 * b) $2.173E+01
 * c) $2.391E+01
 * d) $2.630E+01
 * e) $2.893E+01

4) Calculate the electric field in a 12-gauge copper wire that is 84 m long and carries a current of 48 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 1.664E-04 V/m
 * b) 1.830E-04 V/m
 * c) 2.013E-04 V/m
 * d) 2.215E-04 V/m
 * e) 2.436E-04 V/m

c09 J0
1) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=97 C  and $$\tau=$$0.0132 s. What is the current at $$t=$$0.0225 s?


 * a) 1.336E+03 A
 * b) 1.470E+03 A
 * c) 1.617E+03 A
 * d) 1.779E+03 A
 * e) 1.957E+03 A

2) Calculate the resistance of a 12-gauge copper wire that is 90 m long and carries a current of 34 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 3.432E-01 &Omega;
 * b) 3.775E-01 &Omega;
 * c) 4.153E-01 &Omega;
 * d) 4.568E-01 &Omega;
 * e) 5.025E-01 &Omega;

3) What is consumer cost to operate one 89&minus;W incandescent bulb for 10 hours per day for 1 year (365 days) if the cost of electricity is $0.141 per kilowatt-hour?


 * a) $3.785E+01
 * b) $4.164E+01
 * c) $4.580E+01
 * d) $5.038E+01
 * e) $5.542E+01

4) A device requires consumes 72 W of power and requires 11.7 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * a) 1.519E+06 A/m2
 * b) 1.671E+06 A/m2
 * c) 1.838E+06 A/m2
 * d) 2.022E+06 A/m2
 * e) 2.224E+06 A/m2

c09 J1
1) Calculate the resistance of a 12-gauge copper wire that is 10 m long and carries a current of 69 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 4.614E-02 &Omega;
 * b) 5.076E-02 &Omega;
 * c) 5.583E-02 &Omega;
 * d) 6.141E-02 &Omega;
 * e) 6.756E-02 &Omega;

2) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=42 C  and $$\tau=$$0.0166 s. What is the current at $$t=$$0.0156 s?


 * a) 9.886E+02 A
 * b) 1.087E+03 A
 * c) 1.196E+03 A
 * d) 1.316E+03 A
 * e) 1.447E+03 A

3) A device requires consumes 103 W of power and requires 6.3 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * a) 8.999E+05 A/m2
 * b) 9.899E+05 A/m2
 * c) 1.089E+06 A/m2
 * d) 1.198E+06 A/m2
 * e) 1.317E+06 A/m2

4) What is consumer cost to operate one 69&minus;W incandescent bulb for 7 hours per day for 1 year (365 days) if the cost of electricity is $0.117 per kilowatt-hour?


 * a) $2.063E+01
 * b) $2.269E+01
 * c) $2.496E+01
 * d) $2.745E+01
 * e) $3.020E+01

c09 J2
1) A device requires consumes 103 W of power and requires 6.3 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * a) 8.999E+05 A/m2
 * b) 9.899E+05 A/m2
 * c) 1.089E+06 A/m2
 * d) 1.198E+06 A/m2
 * e) 1.317E+06 A/m2

2) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=23 C  and $$\tau=$$0.0204 s. What is the current at $$t=$$0.0106 s?


 * a) 6.096E+02 A
 * b) 6.706E+02 A
 * c) 7.376E+02 A
 * d) 8.114E+02 A
 * e) 8.925E+02 A

3) What is consumer cost to operate one 57&minus;W incandescent bulb for 11 hours per day for 1 year (365 days) if the cost of electricity is $0.146 per kilowatt-hour?


 * a) $2.282E+01
 * b) $2.510E+01
 * c) $2.761E+01
 * d) $3.038E+01
 * e) $3.341E+01

4) Calculate the resistance of a 12-gauge copper wire that is 30 m long and carries a current of 31 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 1.384E-01 &Omega;
 * b) 1.523E-01 &Omega;
 * c) 1.675E-01 &Omega;
 * d) 1.842E-01 &Omega;
 * e) 2.027E-01 &Omega;

c09 K0
1) Calculate the electric field in a 12-gauge copper wire that is 17 m long and carries a current of 56 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 1.941E-04 V/m
 * b) 2.135E-04 V/m
 * c) 2.349E-04 V/m
 * d) 2.584E-04 V/m
 * e) 2.842E-04 V/m

2) Calculate the resistance of a 12-gauge copper wire that is 30 m long and carries a current of 31 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 1.384E-01 &Omega;
 * b) 1.523E-01 &Omega;
 * c) 1.675E-01 &Omega;
 * d) 1.842E-01 &Omega;
 * e) 2.027E-01 &Omega;

3) What is consumer cost to operate one 89&minus;W incandescent bulb for 10 hours per day for 1 year (365 days) if the cost of electricity is $0.141 per kilowatt-hour?


 * a) $3.785E+01
 * b) $4.164E+01
 * c) $4.580E+01
 * d) $5.038E+01
 * e) $5.542E+01

4) A device requires consumes 196 W of power and requires 2.4 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * a) 4.563E+05 A/m2
 * b) 5.019E+05 A/m2
 * c) 5.521E+05 A/m2
 * d) 6.073E+05 A/m2
 * e) 6.680E+05 A/m2

c09 K1
1) What is consumer cost to operate one 65&minus;W incandescent bulb for 12 hours per day for 1 year (365 days) if the cost of electricity is $0.134 per kilowatt-hour?


 * a) $2.866E+01
 * b) $3.153E+01
 * c) $3.468E+01
 * d) $3.815E+01
 * e) $4.196E+01

2) A device requires consumes 81 W of power and requires 2.34 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * a) 3.342E+05 A/m2
 * b) 3.677E+05 A/m2
 * c) 4.044E+05 A/m2
 * d) 4.449E+05 A/m2
 * e) 4.894E+05 A/m2

3) Calculate the resistance of a 12-gauge copper wire that is 52 m long and carries a current of 99 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 1.983E-01 &Omega;
 * b) 2.181E-01 &Omega;
 * c) 2.399E-01 &Omega;
 * d) 2.639E-01 &Omega;
 * e) 2.903E-01 &Omega;

4) Calculate the electric field in a 12-gauge copper wire that is 18 m long and carries a current of 22 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 1.117E-04 V/m
 * b) 1.228E-04 V/m
 * c) 1.351E-04 V/m
 * d) 1.486E-04 V/m
 * e) 1.635E-04 V/m

c09 K2
1) Calculate the electric field in a 12-gauge copper wire that is 18 m long and carries a current of 22 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 1.117E-04 V/m
 * b) 1.228E-04 V/m
 * c) 1.351E-04 V/m
 * d) 1.486E-04 V/m
 * e) 1.635E-04 V/m

2) What is consumer cost to operate one 76&minus;W incandescent bulb for 9 hours per day for 1 year (365 days) if the cost of electricity is $0.144 per kilowatt-hour?


 * a) $3.595E+01
 * b) $3.955E+01
 * c) $4.350E+01
 * d) $4.785E+01
 * e) $5.264E+01

3) Calculate the resistance of a 12-gauge copper wire that is 11 m long and carries a current of 94 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 3.813E-02 &Omega;
 * b) 4.195E-02 &Omega;
 * c) 4.614E-02 &Omega;
 * d) 5.076E-02 &Omega;
 * e) 5.583E-02 &Omega;

4) A device requires consumes 177 W of power and requires 6.82 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * a) 9.741E+05 A/m2
 * b) 1.072E+06 A/m2
 * c) 1.179E+06 A/m2
 * d) 1.297E+06 A/m2
 * e) 1.426E+06 A/m2

c09 L0
1) A device requires consumes 72 W of power and requires 11.7 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * a) 1.519E+06 A/m2
 * b) 1.671E+06 A/m2
 * c) 1.838E+06 A/m2
 * d) 2.022E+06 A/m2
 * e) 2.224E+06 A/m2

2) What is consumer cost to operate one 102&minus;W incandescent bulb for 5 hours per day for 1 year (365 days) if the cost of electricity is $0.149 per kilowatt-hour?


 * a) $2.292E+01
 * b) $2.521E+01
 * c) $2.774E+01
 * d) $3.051E+01
 * e) $3.356E+01

3) Imagine a substance could be made into a very hot filament. Suppose the resitance is 4.48 &Omega; at a temperature of 56&deg;C and that the temperature coefficient of expansion is 4.550E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 449 &deg;C?


 * a) 1.028E+01 &Omega;
 * b) 1.079E+01 &Omega;
 * c) 1.133E+01 &Omega;
 * d) 1.190E+01 &Omega;
 * e) 1.249E+01 &Omega;

4) Calculate the drift speed of electrons in a copper wire with a diameter of 5.46 mm carrying a 5.05 A current, given that there is one free electron per copper atom. The density of copper is 8.80 x 103kg/m3 and the atomic mass of copper is 63.54 g/mol. Avagadro's number is 6.02 x 1023atoms/mol.


 * a) 1.614E-05 m/s
 * b) 1.776E-05 m/s
 * c) 1.953E-05 m/s
 * d) 2.149E-05 m/s
 * e) 2.363E-05 m/s

c09 L1
1) What is consumer cost to operate one 73&minus;W incandescent bulb for 11 hours per day for 1 year (365 days) if the cost of electricity is $0.113 per kilowatt-hour?


 * a) $3.312E+01
 * b) $3.643E+01
 * c) $4.007E+01
 * d) $4.408E+01
 * e) $4.849E+01

2) A device requires consumes 177 W of power and requires 6.82 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * a) 9.741E+05 A/m2
 * b) 1.072E+06 A/m2
 * c) 1.179E+06 A/m2
 * d) 1.297E+06 A/m2
 * e) 1.426E+06 A/m2

3) Calculate the drift speed of electrons in a copper wire with a diameter of 2.17 mm carrying a 19.4 A current, given that there is one free electron per copper atom. The density of copper is 8.80 x 103kg/m3 and the atomic mass of copper is 63.54 g/mol. Avagadro's number is 6.02 x 1023atoms/mol.


 * a) 3.569E-04 m/s
 * b) 3.926E-04 m/s
 * c) 4.319E-04 m/s
 * d) 4.750E-04 m/s
 * e) 5.226E-04 m/s

4) Imagine a substance could be made into a very hot filament. Suppose the resitance is 5.94 &Omega; at a temperature of 70&deg;C and that the temperature coefficient of expansion is 5.120E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 386 &deg;C?


 * a) 1.279E+01 &Omega;
 * b) 1.343E+01 &Omega;
 * c) 1.410E+01 &Omega;
 * d) 1.481E+01 &Omega;
 * e) 1.555E+01 &Omega;

c09 L2
1) A device requires consumes 78 W of power and requires 11.3 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * a) 1.953E+06 A/m2
 * b) 2.148E+06 A/m2
 * c) 2.363E+06 A/m2
 * d) 2.599E+06 A/m2
 * e) 2.859E+06 A/m2

2) What is consumer cost to operate one 87&minus;W incandescent bulb for 11 hours per day for 1 year (365 days) if the cost of electricity is $0.117 per kilowatt-hour?


 * a) $2.791E+01
 * b) $3.071E+01
 * c) $3.378E+01
 * d) $3.715E+01
 * e) $4.087E+01

3) Imagine a substance could be made into a very hot filament. Suppose the resitance is 4.48 &Omega; at a temperature of 56&deg;C and that the temperature coefficient of expansion is 4.550E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 449 &deg;C?


 * a) 1.028E+01 &Omega;
 * b) 1.079E+01 &Omega;
 * c) 1.133E+01 &Omega;
 * d) 1.190E+01 &Omega;
 * e) 1.249E+01 &Omega;

4) Calculate the drift speed of electrons in a copper wire with a diameter of 4.9 mm carrying a 6.43 A current, given that there is one free electron per copper atom. The density of copper is 8.80 x 103kg/m3 and the atomic mass of copper is 63.54 g/mol. Avagadro's number is 6.02 x 1023atoms/mol.


 * a) 2.109E-05 m/s
 * b) 2.320E-05 m/s
 * c) 2.552E-05 m/s
 * d) 2.807E-05 m/s
 * e) 3.088E-05 m/s

c09 M0
1) A device requires consumes 103 W of power and requires 6.3 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * a) 8.999E+05 A/m2
 * b) 9.899E+05 A/m2
 * c) 1.089E+06 A/m2
 * d) 1.198E+06 A/m2
 * e) 1.317E+06 A/m2

2) Calculate the electric field in a 12-gauge copper wire that is 16 m long and carries a current of 58 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 2.212E-04 V/m
 * b) 2.433E-04 V/m
 * c) 2.676E-04 V/m
 * d) 2.944E-04 V/m
 * e) 3.238E-04 V/m

3) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=11 C  and $$\tau=$$0.0162 s. What is the current at $$t=$$0.0249 s?


 * a) 9.972E+01 A
 * b) 1.097E+02 A
 * c) 1.207E+02 A
 * d) 1.327E+02 A
 * e) 1.460E+02 A

4) What is consumer cost to operate one 59&minus;W incandescent bulb for 10 hours per day for 1 year (365 days) if the cost of electricity is $0.132 per kilowatt-hour?


 * a) $2.584E+01
 * b) $2.843E+01
 * c) $3.127E+01
 * d) $3.440E+01
 * e) $3.784E+01

c09 M1
1) What is consumer cost to operate one 102&minus;W incandescent bulb for 5 hours per day for 1 year (365 days) if the cost of electricity is $0.149 per kilowatt-hour?


 * a) $2.292E+01
 * b) $2.521E+01
 * c) $2.774E+01
 * d) $3.051E+01
 * e) $3.356E+01

2) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=18 C  and $$\tau=$$0.0169 s. What is the current at $$t=$$0.0137 s?


 * a) 3.913E+02 A
 * b) 4.305E+02 A
 * c) 4.735E+02 A
 * d) 5.209E+02 A
 * e) 5.729E+02 A

3) Calculate the electric field in a 12-gauge copper wire that is 17 m long and carries a current of 56 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 1.941E-04 V/m
 * b) 2.135E-04 V/m
 * c) 2.349E-04 V/m
 * d) 2.584E-04 V/m
 * e) 2.842E-04 V/m

4) A device requires consumes 166 W of power and requires 9.99 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * a) 1.570E+06 A/m2
 * b) 1.727E+06 A/m2
 * c) 1.899E+06 A/m2
 * d) 2.089E+06 A/m2
 * e) 2.298E+06 A/m2

c09 M2
1) What is consumer cost to operate one 102&minus;W incandescent bulb for 5 hours per day for 1 year (365 days) if the cost of electricity is $0.149 per kilowatt-hour?


 * a) $2.292E+01
 * b) $2.521E+01
 * c) $2.774E+01
 * d) $3.051E+01
 * e) $3.356E+01

2) A device requires consumes 120 W of power and requires 4.85 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * a) 7.620E+05 A/m2
 * b) 8.382E+05 A/m2
 * c) 9.221E+05 A/m2
 * d) 1.014E+06 A/m2
 * e) 1.116E+06 A/m2

3) Calculate the electric field in a 12-gauge copper wire that is 23 m long and carries a current of 64 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 2.953E-04 V/m
 * b) 3.248E-04 V/m
 * c) 3.573E-04 V/m
 * d) 3.930E-04 V/m
 * e) 4.324E-04 V/m

4) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=78 C  and $$\tau=$$0.0244 s. What is the current at $$t=$$0.0225 s?


 * a) 1.271E+03 A
 * b) 1.398E+03 A
 * c) 1.538E+03 A
 * d) 1.692E+03 A
 * e) 1.861E+03 A

c09 N0
1) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=18 C  and $$\tau=$$0.0169 s. What is the current at $$t=$$0.0137 s?


 * a) 3.913E+02 A
 * b) 4.305E+02 A
 * c) 4.735E+02 A
 * d) 5.209E+02 A
 * e) 5.729E+02 A

2) A make-believe metal has a density of 1.480E+04 kg/m3 and an atomic mass of 196.0 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * a) 4.546E+28 e&minus;/m3
 * b) 5.000E+28 e&minus;/m3
 * c) 5.500E+28 e&minus;/m3
 * d) 6.050E+28 e&minus;/m3
 * e) 6.655E+28 e&minus;/m3

3) Calculate the drift speed of electrons in a copper wire with a diameter of 4.38 mm carrying a 5.79 A current, given that there is one free electron per copper atom. The density of copper is 8.80 x 103kg/m3 and the atomic mass of copper is 63.54 g/mol. Avagadro's number is 6.02 x 1023atoms/mol.


 * a) 2.615E-05 m/s
 * b) 2.876E-05 m/s
 * c) 3.164E-05 m/s
 * d) 3.480E-05 m/s
 * e) 3.828E-05 m/s

4) A DC winch moter draws 24 amps at 159 volts as it lifts a 4.120E+03 N weight at a constant speed of 0.657 m/s. Assuming that all the electrical power is either converted into gravitational potential energy or ohmically heats the motor's coils, calculate the coil's resistance.


 * a) 1.447E+00 &Omega;
 * b) 1.591E+00 &Omega;
 * c) 1.751E+00 &Omega;
 * d) 1.926E+00 &Omega;
 * e) 2.118E+00 &Omega;

c09 N1
1) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=42 C  and $$\tau=$$0.0166 s. What is the current at $$t=$$0.0156 s?


 * a) 9.886E+02 A
 * b) 1.087E+03 A
 * c) 1.196E+03 A
 * d) 1.316E+03 A
 * e) 1.447E+03 A

2) Calculate the drift speed of electrons in a copper wire with a diameter of 4.9 mm carrying a 6.43 A current, given that there is one free electron per copper atom. The density of copper is 8.80 x 103kg/m3 and the atomic mass of copper is 63.54 g/mol. Avagadro's number is 6.02 x 1023atoms/mol.


 * a) 2.109E-05 m/s
 * b) 2.320E-05 m/s
 * c) 2.552E-05 m/s
 * d) 2.807E-05 m/s
 * e) 3.088E-05 m/s

3) A DC winch moter draws 20 amps at 169 volts as it lifts a 5.120E+03 N weight at a constant speed of 0.543 m/s. Assuming that all the electrical power is either converted into gravitational potential energy or ohmically heats the motor's coils, calculate the coil's resistance.


 * a) 1.500E+00 &Omega;
 * b) 1.650E+00 &Omega;
 * c) 1.815E+00 &Omega;
 * d) 1.996E+00 &Omega;
 * e) 2.196E+00 &Omega;

4) A make-believe metal has a density of 1.480E+04 kg/m3 and an atomic mass of 73.3 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * a) 1.105E+29 e&minus;/m3
 * b) 1.215E+29 e&minus;/m3
 * c) 1.337E+29 e&minus;/m3
 * d) 1.471E+29 e&minus;/m3
 * e) 1.618E+29 e&minus;/m3

c09 N2
1) A DC winch moter draws 24 amps at 159 volts as it lifts a 4.120E+03 N weight at a constant speed of 0.657 m/s. Assuming that all the electrical power is either converted into gravitational potential energy or ohmically heats the motor's coils, calculate the coil's resistance.


 * a) 1.447E+00 &Omega;
 * b) 1.591E+00 &Omega;
 * c) 1.751E+00 &Omega;
 * d) 1.926E+00 &Omega;
 * e) 2.118E+00 &Omega;

2) Calculate the drift speed of electrons in a copper wire with a diameter of 5.24 mm carrying a 1.8 A current, given that there is one free electron per copper atom. The density of copper is 8.80 x 103kg/m3 and the atomic mass of copper is 63.54 g/mol. Avagadro's number is 6.02 x 1023atoms/mol.


 * a) 6.247E-06 m/s
 * b) 6.872E-06 m/s
 * c) 7.559E-06 m/s
 * d) 8.315E-06 m/s
 * e) 9.146E-06 m/s

3) A make-believe metal has a density of 8.060E+03 kg/m3 and an atomic mass of 19.7 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * a) 1.850E+29 e&minus;/m3
 * b) 2.036E+29 e&minus;/m3
 * c) 2.239E+29 e&minus;/m3
 * d) 2.463E+29 e&minus;/m3
 * e) 2.709E+29 e&minus;/m3

4) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=87 C  and $$\tau=$$0.0154 s. What is the current at $$t=$$0.0211 s?


 * a) 1.435E+03 A
 * b) 1.579E+03 A
 * c) 1.737E+03 A
 * d) 1.910E+03 A
 * e) 2.102E+03 A

c09 O0
1) A device requires consumes 126 W of power and requires 1.11 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * a) 2.110E+05 A/m2
 * b) 2.321E+05 A/m2
 * c) 2.553E+05 A/m2
 * d) 2.809E+05 A/m2
 * e) 3.090E+05 A/m2

2) Imagine a substance could be made into a very hot filament. Suppose the resitance is 4.48 &Omega; at a temperature of 56&deg;C and that the temperature coefficient of expansion is 4.550E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 449 &deg;C?


 * a) 1.028E+01 &Omega;
 * b) 1.079E+01 &Omega;
 * c) 1.133E+01 &Omega;
 * d) 1.190E+01 &Omega;
 * e) 1.249E+01 &Omega;

3) Calculate the resistance of a 12-gauge copper wire that is 45 m long and carries a current of 51 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 1.716E-01 &Omega;
 * b) 1.888E-01 &Omega;
 * c) 2.076E-01 &Omega;
 * d) 2.284E-01 &Omega;
 * e) 2.512E-01 &Omega;

4) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=78 C  and $$\tau=$$0.0244 s. What is the current at $$t=$$0.0225 s?


 * a) 1.271E+03 A
 * b) 1.398E+03 A
 * c) 1.538E+03 A
 * d) 1.692E+03 A
 * e) 1.861E+03 A

c09 O1
1) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=97 C  and $$\tau=$$0.0132 s. What is the current at $$t=$$0.0225 s?


 * a) 1.336E+03 A
 * b) 1.470E+03 A
 * c) 1.617E+03 A
 * d) 1.779E+03 A
 * e) 1.957E+03 A

2) A device requires consumes 81 W of power and requires 2.34 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * a) 3.342E+05 A/m2
 * b) 3.677E+05 A/m2
 * c) 4.044E+05 A/m2
 * d) 4.449E+05 A/m2
 * e) 4.894E+05 A/m2

3) Imagine a substance could be made into a very hot filament. Suppose the resitance is 1.56 &Omega; at a temperature of 97&deg;C and that the temperature coefficient of expansion is 5.020E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 340 &deg;C?


 * a) 3.463E+00 &Omega;
 * b) 3.636E+00 &Omega;
 * c) 3.818E+00 &Omega;
 * d) 4.009E+00 &Omega;
 * e) 4.209E+00 &Omega;

4) Calculate the resistance of a 12-gauge copper wire that is 59 m long and carries a current of 26 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 2.995E-01 &Omega;
 * b) 3.294E-01 &Omega;
 * c) 3.623E-01 &Omega;
 * d) 3.986E-01 &Omega;
 * e) 4.384E-01 &Omega;

c09 O2
1) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=87 C  and $$\tau=$$0.0154 s. What is the current at $$t=$$0.0211 s?


 * a) 1.435E+03 A
 * b) 1.579E+03 A
 * c) 1.737E+03 A
 * d) 1.910E+03 A
 * e) 2.102E+03 A

2) Imagine a substance could be made into a very hot filament. Suppose the resitance is 6.74 &Omega; at a temperature of 89&deg;C and that the temperature coefficient of expansion is 4.990E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 366 &deg;C?


 * a) 1.529E+01 &Omega;
 * b) 1.606E+01 &Omega;
 * c) 1.686E+01 &Omega;
 * d) 1.770E+01 &Omega;
 * e) 1.859E+01 &Omega;

3) A device requires consumes 88 W of power and requires 11.3 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * a) 1.467E+06 A/m2
 * b) 1.614E+06 A/m2
 * c) 1.775E+06 A/m2
 * d) 1.953E+06 A/m2
 * e) 2.148E+06 A/m2

4) Calculate the resistance of a 12-gauge copper wire that is 19 m long and carries a current of 59 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 7.970E-02 &Omega;
 * b) 8.767E-02 &Omega;
 * c) 9.644E-02 &Omega;
 * d) 1.061E-01 &Omega;
 * e) 1.167E-01 &Omega;

c09 P0
1) What is consumer cost to operate one 105&minus;W incandescent bulb for 11 hours per day for 1 year (365 days) if the cost of electricity is $0.131 per kilowatt-hour?


 * a) $5.021E+01
 * b) $5.523E+01
 * c) $6.075E+01
 * d) $6.682E+01
 * e) $7.351E+01

2) Calculate the electric field in a 12-gauge copper wire that is 84 m long and carries a current of 48 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 1.664E-04 V/m
 * b) 1.830E-04 V/m
 * c) 2.013E-04 V/m
 * d) 2.215E-04 V/m
 * e) 2.436E-04 V/m

3) A device requires consumes 120 W of power and requires 4.85 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * a) 7.620E+05 A/m2
 * b) 8.382E+05 A/m2
 * c) 9.221E+05 A/m2
 * d) 1.014E+06 A/m2
 * e) 1.116E+06 A/m2

4) Calculate the resistance of a 12-gauge copper wire that is 15 m long and carries a current of 27 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 5.200E-02 &Omega;
 * b) 5.720E-02 &Omega;
 * c) 6.292E-02 &Omega;
 * d) 6.921E-02 &Omega;
 * e) 7.613E-02 &Omega;

c09 P1
1) Calculate the electric field in a 12-gauge copper wire that is 41 m long and carries a current of 71 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 3.604E-04 V/m
 * b) 3.964E-04 V/m
 * c) 4.360E-04 V/m
 * d) 4.796E-04 V/m
 * e) 5.276E-04 V/m

2) Calculate the resistance of a 12-gauge copper wire that is 69 m long and carries a current of 98 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 2.631E-01 &Omega;
 * b) 2.894E-01 &Omega;
 * c) 3.184E-01 &Omega;
 * d) 3.502E-01 &Omega;
 * e) 3.852E-01 &Omega;

3) What is consumer cost to operate one 73&minus;W incandescent bulb for 11 hours per day for 1 year (365 days) if the cost of electricity is $0.113 per kilowatt-hour?


 * a) $3.312E+01
 * b) $3.643E+01
 * c) $4.007E+01
 * d) $4.408E+01
 * e) $4.849E+01

4) A device requires consumes 166 W of power and requires 9.99 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * a) 1.570E+06 A/m2
 * b) 1.727E+06 A/m2
 * c) 1.899E+06 A/m2
 * d) 2.089E+06 A/m2
 * e) 2.298E+06 A/m2

c09 P2
1) A device requires consumes 120 W of power and requires 4.85 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * a) 7.620E+05 A/m2
 * b) 8.382E+05 A/m2
 * c) 9.221E+05 A/m2
 * d) 1.014E+06 A/m2
 * e) 1.116E+06 A/m2

2) What is consumer cost to operate one 65&minus;W incandescent bulb for 12 hours per day for 1 year (365 days) if the cost of electricity is $0.134 per kilowatt-hour?


 * a) $2.866E+01
 * b) $3.153E+01
 * c) $3.468E+01
 * d) $3.815E+01
 * e) $4.196E+01

3) Calculate the electric field in a 12-gauge copper wire that is 78 m long and carries a current of 24 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 1.218E-04 V/m
 * b) 1.340E-04 V/m
 * c) 1.474E-04 V/m
 * d) 1.621E-04 V/m
 * e) 1.783E-04 V/m

4) Calculate the resistance of a 12-gauge copper wire that is 90 m long and carries a current of 34 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 3.432E-01 &Omega;
 * b) 3.775E-01 &Omega;
 * c) 4.153E-01 &Omega;
 * d) 4.568E-01 &Omega;
 * e) 5.025E-01 &Omega;

c09 Q0
1) What is the average current involved when a truck battery sets in motion 779 C of charge in 3.96 s while starting an engine?


 * a) 1.626E+02 A
 * b) 1.788E+02 A
 * c) 1.967E+02 A
 * d) 2.164E+02 A
 * e) 2.380E+02 A

2) What is consumer cost to operate one 69&minus;W incandescent bulb for 7 hours per day for 1 year (365 days) if the cost of electricity is $0.117 per kilowatt-hour?


 * a) $2.063E+01
 * b) $2.269E+01
 * c) $2.496E+01
 * d) $2.745E+01
 * e) $3.020E+01

3) Calculate the resistance of a 12-gauge copper wire that is 78 m long and carries a current of 82 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 2.974E-01 &Omega;
 * b) 3.272E-01 &Omega;
 * c) 3.599E-01 &Omega;
 * d) 3.959E-01 &Omega;
 * e) 4.355E-01 &Omega;

4) Calculate the electric field in a 12-gauge copper wire that is 18 m long and carries a current of 22 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 1.117E-04 V/m
 * b) 1.228E-04 V/m
 * c) 1.351E-04 V/m
 * d) 1.486E-04 V/m
 * e) 1.635E-04 V/m

c09 Q1
1) What is the average current involved when a truck battery sets in motion 659 C of charge in 5.48 s while starting an engine?


 * a) 8.214E+01 A
 * b) 9.035E+01 A
 * c) 9.938E+01 A
 * d) 1.093E+02 A
 * e) 1.203E+02 A

2) What is consumer cost to operate one 74&minus;W incandescent bulb for 9 hours per day for 1 year (365 days) if the cost of electricity is $0.119 per kilowatt-hour?


 * a) $1.976E+01
 * b) $2.173E+01
 * c) $2.391E+01
 * d) $2.630E+01
 * e) $2.893E+01

3) Calculate the resistance of a 12-gauge copper wire that is 69 m long and carries a current of 98 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 2.631E-01 &Omega;
 * b) 2.894E-01 &Omega;
 * c) 3.184E-01 &Omega;
 * d) 3.502E-01 &Omega;
 * e) 3.852E-01 &Omega;

4) Calculate the electric field in a 12-gauge copper wire that is 44 m long and carries a current of 78 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 2.704E-04 V/m
 * b) 2.974E-04 V/m
 * c) 3.272E-04 V/m
 * d) 3.599E-04 V/m
 * e) 3.959E-04 V/m

c09 Q2
1) What is consumer cost to operate one 69&minus;W incandescent bulb for 7 hours per day for 1 year (365 days) if the cost of electricity is $0.117 per kilowatt-hour?


 * a) $2.063E+01
 * b) $2.269E+01
 * c) $2.496E+01
 * d) $2.745E+01
 * e) $3.020E+01

2) What is the average current involved when a truck battery sets in motion 631 C of charge in 3.8 s while starting an engine?


 * a) 1.661E+02 A
 * b) 1.827E+02 A
 * c) 2.009E+02 A
 * d) 2.210E+02 A
 * e) 2.431E+02 A

3) Calculate the electric field in a 12-gauge copper wire that is 56 m long and carries a current of 81 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 4.111E-04 V/m
 * b) 4.522E-04 V/m
 * c) 4.975E-04 V/m
 * d) 5.472E-04 V/m
 * e) 6.019E-04 V/m

4) Calculate the resistance of a 12-gauge copper wire that is 81 m long and carries a current of 32 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 3.737E-01 &Omega;
 * b) 4.111E-01 &Omega;
 * c) 4.522E-01 &Omega;
 * d) 4.975E-01 &Omega;
 * e) 5.472E-01 &Omega;

c09 R0
1) Calculate the resistance of a 12-gauge copper wire that is 59 m long and carries a current of 26 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 2.995E-01 &Omega;
 * b) 3.294E-01 &Omega;
 * c) 3.623E-01 &Omega;
 * d) 3.986E-01 &Omega;
 * e) 4.384E-01 &Omega;

2) Calculate the electric field in a 12-gauge copper wire that is 62 m long and carries a current of 52 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 1.983E-04 V/m
 * b) 2.181E-04 V/m
 * c) 2.399E-04 V/m
 * d) 2.639E-04 V/m
 * e) 2.903E-04 V/m

3) Imagine a substance could be made into a very hot filament. Suppose the resitance is 1.56 &Omega; at a temperature of 97&deg;C and that the temperature coefficient of expansion is 5.020E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 340 &deg;C?


 * a) 3.463E+00 &Omega;
 * b) 3.636E+00 &Omega;
 * c) 3.818E+00 &Omega;
 * d) 4.009E+00 &Omega;
 * e) 4.209E+00 &Omega;

4) A device requires consumes 176 W of power and requires 11.9 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * a) 2.262E+06 A/m2
 * b) 2.489E+06 A/m2
 * c) 2.737E+06 A/m2
 * d) 3.011E+06 A/m2
 * e) 3.312E+06 A/m2

c09 R1
1) A device requires consumes 73 W of power and requires 9.14 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * a) 1.187E+06 A/m2
 * b) 1.306E+06 A/m2
 * c) 1.436E+06 A/m2
 * d) 1.580E+06 A/m2
 * e) 1.738E+06 A/m2

2) Calculate the electric field in a 12-gauge copper wire that is 21 m long and carries a current of 42 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 1.602E-04 V/m
 * b) 1.762E-04 V/m
 * c) 1.938E-04 V/m
 * d) 2.132E-04 V/m
 * e) 2.345E-04 V/m

3) Calculate the resistance of a 12-gauge copper wire that is 45 m long and carries a current of 51 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 1.716E-01 &Omega;
 * b) 1.888E-01 &Omega;
 * c) 2.076E-01 &Omega;
 * d) 2.284E-01 &Omega;
 * e) 2.512E-01 &Omega;

4) Imagine a substance could be made into a very hot filament. Suppose the resitance is 5.94 &Omega; at a temperature of 70&deg;C and that the temperature coefficient of expansion is 5.120E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 386 &deg;C?


 * a) 1.279E+01 &Omega;
 * b) 1.343E+01 &Omega;
 * c) 1.410E+01 &Omega;
 * d) 1.481E+01 &Omega;
 * e) 1.555E+01 &Omega;

c09 R2
1) Calculate the resistance of a 12-gauge copper wire that is 48 m long and carries a current of 50 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 2.215E-01 &Omega;
 * b) 2.436E-01 &Omega;
 * c) 2.680E-01 &Omega;
 * d) 2.948E-01 &Omega;
 * e) 3.243E-01 &Omega;

2) Calculate the electric field in a 12-gauge copper wire that is 84 m long and carries a current of 48 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 1.664E-04 V/m
 * b) 1.830E-04 V/m
 * c) 2.013E-04 V/m
 * d) 2.215E-04 V/m
 * e) 2.436E-04 V/m

3) A device requires consumes 73 W of power and requires 9.14 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * a) 1.187E+06 A/m2
 * b) 1.306E+06 A/m2
 * c) 1.436E+06 A/m2
 * d) 1.580E+06 A/m2
 * e) 1.738E+06 A/m2

4) Imagine a substance could be made into a very hot filament. Suppose the resitance is 1.98 &Omega; at a temperature of 92&deg;C and that the temperature coefficient of expansion is 5.080E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 455 &deg;C?


 * a) 5.363E+00 &Omega;
 * b) 5.631E+00 &Omega;
 * c) 5.913E+00 &Omega;
 * d) 6.208E+00 &Omega;
 * e) 6.519E+00 &Omega;

c09 S0
1) A make-believe metal has a density of 3.230E+03 kg/m3 and an atomic mass of 116.0 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * a) 1.385E+28 e&minus;/m3
 * b) 1.524E+28 e&minus;/m3
 * c) 1.676E+28 e&minus;/m3
 * d) 1.844E+28 e&minus;/m3
 * e) 2.028E+28 e&minus;/m3

2) Calculate the drift speed of electrons in a copper wire with a diameter of 4.49 mm carrying a 11.6 A current, given that there is one free electron per copper atom. The density of copper is 8.80 x 103kg/m3 and the atomic mass of copper is 63.54 g/mol. Avagadro's number is 6.02 x 1023atoms/mol.


 * a) 4.120E-05 m/s
 * b) 4.532E-05 m/s
 * c) 4.985E-05 m/s
 * d) 5.483E-05 m/s
 * e) 6.032E-05 m/s

3) Calculate the electric field in a 12-gauge copper wire that is 15 m long and carries a current of 85 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 2.947E-04 V/m
 * b) 3.241E-04 V/m
 * c) 3.565E-04 V/m
 * d) 3.922E-04 V/m
 * e) 4.314E-04 V/m

4) A device requires consumes 78 W of power and requires 11.3 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * a) 1.953E+06 A/m2
 * b) 2.148E+06 A/m2
 * c) 2.363E+06 A/m2
 * d) 2.599E+06 A/m2
 * e) 2.859E+06 A/m2

c09 S1
1) Calculate the electric field in a 12-gauge copper wire that is 21 m long and carries a current of 42 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 1.602E-04 V/m
 * b) 1.762E-04 V/m
 * c) 1.938E-04 V/m
 * d) 2.132E-04 V/m
 * e) 2.345E-04 V/m

2) A make-believe metal has a density of 1.300E+04 kg/m3 and an atomic mass of 75.7 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * a) 9.398E+28 e&minus;/m3
 * b) 1.034E+29 e&minus;/m3
 * c) 1.137E+29 e&minus;/m3
 * d) 1.251E+29 e&minus;/m3
 * e) 1.376E+29 e&minus;/m3

3) A device requires consumes 172 W of power and requires 2.21 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * a) 3.157E+05 A/m2
 * b) 3.472E+05 A/m2
 * c) 3.820E+05 A/m2
 * d) 4.202E+05 A/m2
 * e) 4.622E+05 A/m2

4) Calculate the drift speed of electrons in a copper wire with a diameter of 3.3 mm carrying a 18.5 A current, given that there is one free electron per copper atom. The density of copper is 8.80 x 103kg/m3 and the atomic mass of copper is 63.54 g/mol. Avagadro's number is 6.02 x 1023atoms/mol.


 * a) 1.472E-04 m/s
 * b) 1.619E-04 m/s
 * c) 1.781E-04 m/s
 * d) 1.959E-04 m/s
 * e) 2.155E-04 m/s

c09 S2
1) A device requires consumes 84 W of power and requires 3.66 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * a) 5.751E+05 A/m2
 * b) 6.326E+05 A/m2
 * c) 6.958E+05 A/m2
 * d) 7.654E+05 A/m2
 * e) 8.419E+05 A/m2

2) Calculate the electric field in a 12-gauge copper wire that is 16 m long and carries a current of 58 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 2.212E-04 V/m
 * b) 2.433E-04 V/m
 * c) 2.676E-04 V/m
 * d) 2.944E-04 V/m
 * e) 3.238E-04 V/m

3) Calculate the drift speed of electrons in a copper wire with a diameter of 5.47 mm carrying a 3.48 A current, given that there is one free electron per copper atom. The density of copper is 8.80 x 103kg/m3 and the atomic mass of copper is 63.54 g/mol. Avagadro's number is 6.02 x 1023atoms/mol.


 * a) 1.008E-05 m/s
 * b) 1.108E-05 m/s
 * c) 1.219E-05 m/s
 * d) 1.341E-05 m/s
 * e) 1.475E-05 m/s

4) A make-believe metal has a density of 6.650E+03 kg/m3 and an atomic mass of 67.5 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * a) 4.456E+28 e&minus;/m3
 * b) 4.901E+28 e&minus;/m3
 * c) 5.392E+28 e&minus;/m3
 * d) 5.931E+28 e&minus;/m3
 * e) 6.524E+28 e&minus;/m3

c09 T0
1) What is the average current involved when a truck battery sets in motion 572 C of charge in 3.33 s while starting an engine?


 * a) 1.173E+02 A
 * b) 1.291E+02 A
 * c) 1.420E+02 A
 * d) 1.562E+02 A
 * e) 1.718E+02 A

2) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=18 C  and $$\tau=$$0.0169 s. What is the current at $$t=$$0.0137 s?


 * a) 3.913E+02 A
 * b) 4.305E+02 A
 * c) 4.735E+02 A
 * d) 5.209E+02 A
 * e) 5.729E+02 A

3) A make-believe metal has a density of 1.580E+04 kg/m3 and an atomic mass of 41.5 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * a) 2.292E+29 e&minus;/m3
 * b) 2.521E+29 e&minus;/m3
 * c) 2.773E+29 e&minus;/m3
 * d) 3.051E+29 e&minus;/m3
 * e) 3.356E+29 e&minus;/m3

4) Calculate the electric field in a 12-gauge copper wire that is 62 m long and carries a current of 52 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 1.983E-04 V/m
 * b) 2.181E-04 V/m
 * c) 2.399E-04 V/m
 * d) 2.639E-04 V/m
 * e) 2.903E-04 V/m

c09 T1
1) What is the average current involved when a truck battery sets in motion 572 C of charge in 3.33 s while starting an engine?


 * a) 1.173E+02 A
 * b) 1.291E+02 A
 * c) 1.420E+02 A
 * d) 1.562E+02 A
 * e) 1.718E+02 A

2) A make-believe metal has a density of 1.180E+04 kg/m3 and an atomic mass of 121.0 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * a) 4.010E+28 e&minus;/m3
 * b) 4.411E+28 e&minus;/m3
 * c) 4.852E+28 e&minus;/m3
 * d) 5.337E+28 e&minus;/m3
 * e) 5.871E+28 e&minus;/m3

3) Calculate the electric field in a 12-gauge copper wire that is 64 m long and carries a current of 76 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 2.635E-04 V/m
 * b) 2.898E-04 V/m
 * c) 3.188E-04 V/m
 * d) 3.507E-04 V/m
 * e) 3.857E-04 V/m

4) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=11 C  and $$\tau=$$0.0162 s. What is the current at $$t=$$0.0249 s?


 * a) 9.972E+01 A
 * b) 1.097E+02 A
 * c) 1.207E+02 A
 * d) 1.327E+02 A
 * e) 1.460E+02 A

c09 T2
1) A make-believe metal has a density of 3.470E+03 kg/m3 and an atomic mass of 33.8 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * a) 6.180E+28 e&minus;/m3
 * b) 6.798E+28 e&minus;/m3
 * c) 7.478E+28 e&minus;/m3
 * d) 8.226E+28 e&minus;/m3
 * e) 9.049E+28 e&minus;/m3

2) What is the average current involved when a truck battery sets in motion 659 C of charge in 5.48 s while starting an engine?


 * a) 8.214E+01 A
 * b) 9.035E+01 A
 * c) 9.938E+01 A
 * d) 1.093E+02 A
 * e) 1.203E+02 A

3) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=58 C  and $$\tau=$$0.0249 s. What is the current at $$t=$$0.0191 s?


 * a) 8.127E+02 A
 * b) 8.939E+02 A
 * c) 9.833E+02 A
 * d) 1.082E+03 A
 * e) 1.190E+03 A

4) Calculate the electric field in a 12-gauge copper wire that is 23 m long and carries a current of 64 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 2.953E-04 V/m
 * b) 3.248E-04 V/m
 * c) 3.573E-04 V/m
 * d) 3.930E-04 V/m
 * e) 4.324E-04 V/m

c09 U0
1) Calculate the electric field in a 12-gauge copper wire that is 78 m long and carries a current of 24 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 1.218E-04 V/m
 * b) 1.340E-04 V/m
 * c) 1.474E-04 V/m
 * d) 1.621E-04 V/m
 * e) 1.783E-04 V/m

2) What is the average current involved when a truck battery sets in motion 738 C of charge in 3.87 s while starting an engine?


 * a) 1.907E+02 A
 * b) 2.098E+02 A
 * c) 2.307E+02 A
 * d) 2.538E+02 A
 * e) 2.792E+02 A

3) Imagine a substance could be made into a very hot filament. Suppose the resitance is 3.58 &Omega; at a temperature of 24&deg;C and that the temperature coefficient of expansion is 5.520E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 349 &deg;C?


 * a) 9.526E+00 &Omega;
 * b) 1.000E+01 &Omega;
 * c) 1.050E+01 &Omega;
 * d) 1.103E+01 &Omega;
 * e) 1.158E+01 &Omega;

4) A device requires consumes 176 W of power and requires 11.9 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * a) 2.262E+06 A/m2
 * b) 2.489E+06 A/m2
 * c) 2.737E+06 A/m2
 * d) 3.011E+06 A/m2
 * e) 3.312E+06 A/m2

c09 U1
1) What is the average current involved when a truck battery sets in motion 779 C of charge in 3.96 s while starting an engine?


 * a) 1.626E+02 A
 * b) 1.788E+02 A
 * c) 1.967E+02 A
 * d) 2.164E+02 A
 * e) 2.380E+02 A

2) Calculate the electric field in a 12-gauge copper wire that is 21 m long and carries a current of 42 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 1.602E-04 V/m
 * b) 1.762E-04 V/m
 * c) 1.938E-04 V/m
 * d) 2.132E-04 V/m
 * e) 2.345E-04 V/m

3) A device requires consumes 78 W of power and requires 11.3 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * a) 1.953E+06 A/m2
 * b) 2.148E+06 A/m2
 * c) 2.363E+06 A/m2
 * d) 2.599E+06 A/m2
 * e) 2.859E+06 A/m2

4) Imagine a substance could be made into a very hot filament. Suppose the resitance is 3.58 &Omega; at a temperature of 24&deg;C and that the temperature coefficient of expansion is 5.520E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 349 &deg;C?


 * a) 9.526E+00 &Omega;
 * b) 1.000E+01 &Omega;
 * c) 1.050E+01 &Omega;
 * d) 1.103E+01 &Omega;
 * e) 1.158E+01 &Omega;

c09 U2
1) What is the average current involved when a truck battery sets in motion 631 C of charge in 3.8 s while starting an engine?


 * a) 1.661E+02 A
 * b) 1.827E+02 A
 * c) 2.009E+02 A
 * d) 2.210E+02 A
 * e) 2.431E+02 A

2) A device requires consumes 142 W of power and requires 12.1 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * a) 2.300E+06 A/m2
 * b) 2.530E+06 A/m2
 * c) 2.783E+06 A/m2
 * d) 3.062E+06 A/m2
 * e) 3.368E+06 A/m2

3) Imagine a substance could be made into a very hot filament. Suppose the resitance is 5.94 &Omega; at a temperature of 70&deg;C and that the temperature coefficient of expansion is 5.120E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 386 &deg;C?


 * a) 1.279E+01 &Omega;
 * b) 1.343E+01 &Omega;
 * c) 1.410E+01 &Omega;
 * d) 1.481E+01 &Omega;
 * e) 1.555E+01 &Omega;

4) Calculate the electric field in a 12-gauge copper wire that is 17 m long and carries a current of 56 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 1.941E-04 V/m
 * b) 2.135E-04 V/m
 * c) 2.349E-04 V/m
 * d) 2.584E-04 V/m
 * e) 2.842E-04 V/m

c09 V0
1) What is consumer cost to operate one 56&minus;W incandescent bulb for 6 hours per day for 1 year (365 days) if the cost of electricity is $0.13 per kilowatt-hour?


 * a) $1.198E+01
 * b) $1.318E+01
 * c) $1.449E+01
 * d) $1.594E+01
 * e) $1.754E+01

2) A device requires consumes 196 W of power and requires 2.4 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * a) 4.563E+05 A/m2
 * b) 5.019E+05 A/m2
 * c) 5.521E+05 A/m2
 * d) 6.073E+05 A/m2
 * e) 6.680E+05 A/m2

3) What is the average current involved when a truck battery sets in motion 559 C of charge in 4.13 s while starting an engine?


 * a) 9.245E+01 A
 * b) 1.017E+02 A
 * c) 1.119E+02 A
 * d) 1.230E+02 A
 * e) 1.354E+02 A

4) Calculate the resistance of a 12-gauge copper wire that is 19 m long and carries a current of 59 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 7.970E-02 &Omega;
 * b) 8.767E-02 &Omega;
 * c) 9.644E-02 &Omega;
 * d) 1.061E-01 &Omega;
 * e) 1.167E-01 &Omega;

c09 V1
1) Calculate the resistance of a 12-gauge copper wire that is 86 m long and carries a current of 97 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 4.365E-01 &Omega;
 * b) 4.801E-01 &Omega;
 * c) 5.282E-01 &Omega;
 * d) 5.810E-01 &Omega;
 * e) 6.391E-01 &Omega;

2) What is consumer cost to operate one 102&minus;W incandescent bulb for 6 hours per day for 1 year (365 days) if the cost of electricity is $0.127 per kilowatt-hour?


 * a) $2.131E+01
 * b) $2.345E+01
 * c) $2.579E+01
 * d) $2.837E+01
 * e) $3.121E+01

3) What is the average current involved when a truck battery sets in motion 659 C of charge in 5.48 s while starting an engine?


 * a) 8.214E+01 A
 * b) 9.035E+01 A
 * c) 9.938E+01 A
 * d) 1.093E+02 A
 * e) 1.203E+02 A

4) A device requires consumes 103 W of power and requires 6.3 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * a) 8.999E+05 A/m2
 * b) 9.899E+05 A/m2
 * c) 1.089E+06 A/m2
 * d) 1.198E+06 A/m2
 * e) 1.317E+06 A/m2

c09 V2
1) What is the average current involved when a truck battery sets in motion 682 C of charge in 5.29 s while starting an engine?


 * a) 1.065E+02 A
 * b) 1.172E+02 A
 * c) 1.289E+02 A
 * d) 1.418E+02 A
 * e) 1.560E+02 A

2) Calculate the resistance of a 12-gauge copper wire that is 48 m long and carries a current of 50 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 2.215E-01 &Omega;
 * b) 2.436E-01 &Omega;
 * c) 2.680E-01 &Omega;
 * d) 2.948E-01 &Omega;
 * e) 3.243E-01 &Omega;

3) What is consumer cost to operate one 76&minus;W incandescent bulb for 9 hours per day for 1 year (365 days) if the cost of electricity is $0.144 per kilowatt-hour?


 * a) $3.595E+01
 * b) $3.955E+01
 * c) $4.350E+01
 * d) $4.785E+01
 * e) $5.264E+01

4) A device requires consumes 196 W of power and requires 2.4 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * a) 4.563E+05 A/m2
 * b) 5.019E+05 A/m2
 * c) 5.521E+05 A/m2
 * d) 6.073E+05 A/m2
 * e) 6.680E+05 A/m2

c09 W0
1) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=97 C  and $$\tau=$$0.0132 s. What is the current at $$t=$$0.0225 s?


 * a) 1.336E+03 A
 * b) 1.470E+03 A
 * c) 1.617E+03 A
 * d) 1.779E+03 A
 * e) 1.957E+03 A

2) Imagine a substance could be made into a very hot filament. Suppose the resitance is 5.89 &Omega; at a temperature of 43&deg;C and that the temperature coefficient of expansion is 4.400E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 398 &deg;C?


 * a) 1.369E+01 &Omega;
 * b) 1.437E+01 &Omega;
 * c) 1.509E+01 &Omega;
 * d) 1.584E+01 &Omega;
 * e) 1.664E+01 &Omega;

3) Calculate the electric field in a 12-gauge copper wire that is 18 m long and carries a current of 22 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 1.117E-04 V/m
 * b) 1.228E-04 V/m
 * c) 1.351E-04 V/m
 * d) 1.486E-04 V/m
 * e) 1.635E-04 V/m

4) Calculate the drift speed of electrons in a copper wire with a diameter of 3.53 mm carrying a 2.8 A current, given that there is one free electron per copper atom. The density of copper is 8.80 x 103kg/m3 and the atomic mass of copper is 63.54 g/mol. Avagadro's number is 6.02 x 1023atoms/mol.


 * a) 1.947E-05 m/s
 * b) 2.141E-05 m/s
 * c) 2.355E-05 m/s
 * d) 2.591E-05 m/s
 * e) 2.850E-05 m/s

c09 W1
1) Imagine a substance could be made into a very hot filament. Suppose the resitance is 6.74 &Omega; at a temperature of 89&deg;C and that the temperature coefficient of expansion is 4.990E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 366 &deg;C?


 * a) 1.529E+01 &Omega;
 * b) 1.606E+01 &Omega;
 * c) 1.686E+01 &Omega;
 * d) 1.770E+01 &Omega;
 * e) 1.859E+01 &Omega;

2) Calculate the drift speed of electrons in a copper wire with a diameter of 5.71 mm carrying a 7.54 A current, given that there is one free electron per copper atom. The density of copper is 8.80 x 103kg/m3 and the atomic mass of copper is 63.54 g/mol. Avagadro's number is 6.02 x 1023atoms/mol.


 * a) 2.204E-05 m/s
 * b) 2.424E-05 m/s
 * c) 2.667E-05 m/s
 * d) 2.933E-05 m/s
 * e) 3.227E-05 m/s

3) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=85 C  and $$\tau=$$0.021 s. What is the current at $$t=$$0.0128 s?


 * a) 1.503E+03 A
 * b) 1.653E+03 A
 * c) 1.818E+03 A
 * d) 2.000E+03 A
 * e) 2.200E+03 A

4) Calculate the electric field in a 12-gauge copper wire that is 62 m long and carries a current of 52 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 1.983E-04 V/m
 * b) 2.181E-04 V/m
 * c) 2.399E-04 V/m
 * d) 2.639E-04 V/m
 * e) 2.903E-04 V/m

c09 W2
1) Imagine a substance could be made into a very hot filament. Suppose the resitance is 5.73 &Omega; at a temperature of 99&deg;C and that the temperature coefficient of expansion is 5.260E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 420 &deg;C?


 * a) 1.267E+01 &Omega;
 * b) 1.331E+01 &Omega;
 * c) 1.397E+01 &Omega;
 * d) 1.467E+01 &Omega;
 * e) 1.540E+01 &Omega;

2) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=85 C  and $$\tau=$$0.021 s. What is the current at $$t=$$0.0128 s?


 * a) 1.503E+03 A
 * b) 1.653E+03 A
 * c) 1.818E+03 A
 * d) 2.000E+03 A
 * e) 2.200E+03 A

3) Calculate the drift speed of electrons in a copper wire with a diameter of 2.72 mm carrying a 16.2 A current, given that there is one free electron per copper atom. The density of copper is 8.80 x 103kg/m3 and the atomic mass of copper is 63.54 g/mol. Avagadro's number is 6.02 x 1023atoms/mol.


 * a) 2.087E-04 m/s
 * b) 2.295E-04 m/s
 * c) 2.525E-04 m/s
 * d) 2.777E-04 m/s
 * e) 3.055E-04 m/s

4) Calculate the electric field in a 12-gauge copper wire that is 44 m long and carries a current of 78 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 2.704E-04 V/m
 * b) 2.974E-04 V/m
 * c) 3.272E-04 V/m
 * d) 3.599E-04 V/m
 * e) 3.959E-04 V/m

c09 X0
1) What is the average current involved when a truck battery sets in motion 682 C of charge in 5.29 s while starting an engine?


 * a) 1.065E+02 A
 * b) 1.172E+02 A
 * c) 1.289E+02 A
 * d) 1.418E+02 A
 * e) 1.560E+02 A

2) Calculate the drift speed of electrons in a copper wire with a diameter of 5.82 mm carrying a 9.11 A current, given that there is one free electron per copper atom. The density of copper is 8.80 x 103kg/m3 and the atomic mass of copper is 63.54 g/mol. Avagadro's number is 6.02 x 1023atoms/mol.


 * a) 1.926E-05 m/s
 * b) 2.118E-05 m/s
 * c) 2.330E-05 m/s
 * d) 2.563E-05 m/s
 * e) 2.819E-05 m/s

3) A DC winch moter draws 20 amps at 157 volts as it lifts a 5.270E+03 N weight at a constant speed of 0.403 m/s. Assuming that all the electrical power is either converted into gravitational potential energy or ohmically heats the motor's coils, calculate the coil's resistance.


 * a) 2.540E+00 &Omega;
 * b) 2.795E+00 &Omega;
 * c) 3.074E+00 &Omega;
 * d) 3.381E+00 &Omega;
 * e) 3.720E+00 &Omega;

4) Calculate the electric field in a 12-gauge copper wire that is 18 m long and carries a current of 22 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 1.117E-04 V/m
 * b) 1.228E-04 V/m
 * c) 1.351E-04 V/m
 * d) 1.486E-04 V/m
 * e) 1.635E-04 V/m

c09 X1
1) Calculate the electric field in a 12-gauge copper wire that is 15 m long and carries a current of 85 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 2.947E-04 V/m
 * b) 3.241E-04 V/m
 * c) 3.565E-04 V/m
 * d) 3.922E-04 V/m
 * e) 4.314E-04 V/m

2) Calculate the drift speed of electrons in a copper wire with a diameter of 2.72 mm carrying a 16.2 A current, given that there is one free electron per copper atom. The density of copper is 8.80 x 103kg/m3 and the atomic mass of copper is 63.54 g/mol. Avagadro's number is 6.02 x 1023atoms/mol.


 * a) 2.087E-04 m/s
 * b) 2.295E-04 m/s
 * c) 2.525E-04 m/s
 * d) 2.777E-04 m/s
 * e) 3.055E-04 m/s

3) What is the average current involved when a truck battery sets in motion 559 C of charge in 4.13 s while starting an engine?


 * a) 9.245E+01 A
 * b) 1.017E+02 A
 * c) 1.119E+02 A
 * d) 1.230E+02 A
 * e) 1.354E+02 A

4) A DC winch moter draws 18 amps at 126 volts as it lifts a 5.830E+03 N weight at a constant speed of 0.26 m/s. Assuming that all the electrical power is either converted into gravitational potential energy or ohmically heats the motor's coils, calculate the coil's resistance.


 * a) 1.919E+00 &Omega;
 * b) 2.111E+00 &Omega;
 * c) 2.322E+00 &Omega;
 * d) 2.554E+00 &Omega;
 * e) 2.809E+00 &Omega;

c09 X2
1) A DC winch moter draws 27 amps at 190 volts as it lifts a 4.910E+03 N weight at a constant speed of 0.769 m/s. Assuming that all the electrical power is either converted into gravitational potential energy or ohmically heats the motor's coils, calculate the coil's resistance.


 * a) 1.396E+00 &Omega;
 * b) 1.535E+00 &Omega;
 * c) 1.689E+00 &Omega;
 * d) 1.858E+00 &Omega;
 * e) 2.043E+00 &Omega;

2) Calculate the drift speed of electrons in a copper wire with a diameter of 5.71 mm carrying a 7.54 A current, given that there is one free electron per copper atom. The density of copper is 8.80 x 103kg/m3 and the atomic mass of copper is 63.54 g/mol. Avagadro's number is 6.02 x 1023atoms/mol.


 * a) 2.204E-05 m/s
 * b) 2.424E-05 m/s
 * c) 2.667E-05 m/s
 * d) 2.933E-05 m/s
 * e) 3.227E-05 m/s

3) Calculate the electric field in a 12-gauge copper wire that is 21 m long and carries a current of 42 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * a) 1.602E-04 V/m
 * b) 1.762E-04 V/m
 * c) 1.938E-04 V/m
 * d) 2.132E-04 V/m
 * e) 2.345E-04 V/m

4) What is the average current involved when a truck battery sets in motion 682 C of charge in 5.29 s while starting an engine?


 * a) 1.065E+02 A
 * b) 1.172E+02 A
 * c) 1.289E+02 A
 * d) 1.418E+02 A
 * e) 1.560E+02 A

c09 Y0
1) Imagine a substance could be made into a very hot filament. Suppose the resitance is 4.08 &Omega; at a temperature of 26&deg;C and that the temperature coefficient of expansion is 4.800E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 388 &deg;C?


 * a) 1.064E+01 &Omega;
 * b) 1.117E+01 &Omega;
 * c) 1.173E+01 &Omega;
 * d) 1.231E+01 &Omega;
 * e) 1.293E+01 &Omega;

2) A DC winch moter draws 12 amps at 129 volts as it lifts a 4.210E+03 N weight at a constant speed of 0.318 m/s. Assuming that all the electrical power is either converted into gravitational potential energy or ohmically heats the motor's coils, calculate the coil's resistance.


 * a) 9.924E-01 &Omega;
 * b) 1.092E+00 &Omega;
 * c) 1.201E+00 &Omega;
 * d) 1.321E+00 &Omega;
 * e) 1.453E+00 &Omega;

3) A make-believe metal has a density of 1.510E+04 kg/m3 and an atomic mass of 33.6 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * a) 2.236E+29 e&minus;/m3
 * b) 2.459E+29 e&minus;/m3
 * c) 2.705E+29 e&minus;/m3
 * d) 2.976E+29 e&minus;/m3
 * e) 3.274E+29 e&minus;/m3

4) What is consumer cost to operate one 57&minus;W incandescent bulb for 11 hours per day for 1 year (365 days) if the cost of electricity is $0.146 per kilowatt-hour?


 * a) $2.282E+01
 * b) $2.510E+01
 * c) $2.761E+01
 * d) $3.038E+01
 * e) $3.341E+01

c09 Y1
1) Imagine a substance could be made into a very hot filament. Suppose the resitance is 6.06 &Omega; at a temperature of 80&deg;C and that the temperature coefficient of expansion is 4.290E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 330 &deg;C?


 * a) 1.196E+01 &Omega;
 * b) 1.256E+01 &Omega;
 * c) 1.319E+01 &Omega;
 * d) 1.385E+01 &Omega;
 * e) 1.454E+01 &Omega;

2) A make-believe metal has a density of 1.050E+04 kg/m3 and an atomic mass of 58.8 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * a) 1.075E+29 e&minus;/m3
 * b) 1.183E+29 e&minus;/m3
 * c) 1.301E+29 e&minus;/m3
 * d) 1.431E+29 e&minus;/m3
 * e) 1.574E+29 e&minus;/m3

3) What is consumer cost to operate one 104&minus;W incandescent bulb for 6 hours per day for 1 year (365 days) if the cost of electricity is $0.136 per kilowatt-hour?


 * a) $2.116E+01
 * b) $2.327E+01
 * c) $2.560E+01
 * d) $2.816E+01
 * e) $3.098E+01

4) A DC winch moter draws 17 amps at 187 volts as it lifts a 5.600E+03 N weight at a constant speed of 0.381 m/s. Assuming that all the electrical power is either converted into gravitational potential energy or ohmically heats the motor's coils, calculate the coil's resistance.


 * a) 2.471E+00 &Omega;
 * b) 2.718E+00 &Omega;
 * c) 2.990E+00 &Omega;
 * d) 3.288E+00 &Omega;
 * e) 3.617E+00 &Omega;

c09 Y2
1) A DC winch moter draws 20 amps at 169 volts as it lifts a 5.120E+03 N weight at a constant speed of 0.543 m/s. Assuming that all the electrical power is either converted into gravitational potential energy or ohmically heats the motor's coils, calculate the coil's resistance.


 * a) 1.500E+00 &Omega;
 * b) 1.650E+00 &Omega;
 * c) 1.815E+00 &Omega;
 * d) 1.996E+00 &Omega;
 * e) 2.196E+00 &Omega;

2) What is consumer cost to operate one 115&minus;W incandescent bulb for 12 hours per day for 1 year (365 days) if the cost of electricity is $0.128 per kilowatt-hour?


 * a) $5.328E+01
 * b) $5.861E+01
 * c) $6.447E+01
 * d) $7.092E+01
 * e) $7.801E+01

3) Imagine a substance could be made into a very hot filament. Suppose the resitance is 4.08 &Omega; at a temperature of 26&deg;C and that the temperature coefficient of expansion is 4.800E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 388 &deg;C?


 * a) 1.064E+01 &Omega;
 * b) 1.117E+01 &Omega;
 * c) 1.173E+01 &Omega;
 * d) 1.231E+01 &Omega;
 * e) 1.293E+01 &Omega;

4) A make-believe metal has a density of 1.300E+04 kg/m3 and an atomic mass of 75.7 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * a) 9.398E+28 e&minus;/m3
 * b) 1.034E+29 e&minus;/m3
 * c) 1.137E+29 e&minus;/m3
 * d) 1.251E+29 e&minus;/m3
 * e) 1.376E+29 e&minus;/m3

c09 Z0
1) What is consumer cost to operate one 74&minus;W incandescent bulb for 9 hours per day for 1 year (365 days) if the cost of electricity is $0.119 per kilowatt-hour?


 * a) $1.976E+01
 * b) $2.173E+01
 * c) $2.391E+01
 * d) $2.630E+01
 * e) $2.893E+01

2) Imagine a substance could be made into a very hot filament. Suppose the resitance is 1.52 &Omega; at a temperature of 45&deg;C and that the temperature coefficient of expansion is 4.330E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 479 &deg;C?


 * a) 3.970E+00 &Omega;
 * b) 4.168E+00 &Omega;
 * c) 4.376E+00 &Omega;
 * d) 4.595E+00 &Omega;
 * e) 4.825E+00 &Omega;

3) Calculate the drift speed of electrons in a copper wire with a diameter of 5.46 mm carrying a 8.19 A current, given that there is one free electron per copper atom. The density of copper is 8.80 x 103kg/m3 and the atomic mass of copper is 63.54 g/mol. Avagadro's number is 6.02 x 1023atoms/mol.


 * a) 2.380E-05 m/s
 * b) 2.618E-05 m/s
 * c) 2.880E-05 m/s
 * d) 3.168E-05 m/s
 * e) 3.485E-05 m/s

4) A device requires consumes 73 W of power and requires 9.14 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * a) 1.187E+06 A/m2
 * b) 1.306E+06 A/m2
 * c) 1.436E+06 A/m2
 * d) 1.580E+06 A/m2
 * e) 1.738E+06 A/m2

c09 Z1
1) What is consumer cost to operate one 74&minus;W incandescent bulb for 9 hours per day for 1 year (365 days) if the cost of electricity is $0.119 per kilowatt-hour?


 * a) $1.976E+01
 * b) $2.173E+01
 * c) $2.391E+01
 * d) $2.630E+01
 * e) $2.893E+01

2) Calculate the drift speed of electrons in a copper wire with a diameter of 5.33 mm carrying a 5.1 A current, given that there is one free electron per copper atom. The density of copper is 8.80 x 103kg/m3 and the atomic mass of copper is 63.54 g/mol. Avagadro's number is 6.02 x 1023atoms/mol.


 * a) 1.711E-05 m/s
 * b) 1.882E-05 m/s
 * c) 2.070E-05 m/s
 * d) 2.277E-05 m/s
 * e) 2.505E-05 m/s

3) A device requires consumes 177 W of power and requires 6.82 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * a) 9.741E+05 A/m2
 * b) 1.072E+06 A/m2
 * c) 1.179E+06 A/m2
 * d) 1.297E+06 A/m2
 * e) 1.426E+06 A/m2

4) Imagine a substance could be made into a very hot filament. Suppose the resitance is 3.58 &Omega; at a temperature of 24&deg;C and that the temperature coefficient of expansion is 5.520E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 349 &deg;C?


 * a) 9.526E+00 &Omega;
 * b) 1.000E+01 &Omega;
 * c) 1.050E+01 &Omega;
 * d) 1.103E+01 &Omega;
 * e) 1.158E+01 &Omega;

c09 Z2
1) Calculate the drift speed of electrons in a copper wire with a diameter of 5.47 mm carrying a 3.48 A current, given that there is one free electron per copper atom. The density of copper is 8.80 x 103kg/m3 and the atomic mass of copper is 63.54 g/mol. Avagadro's number is 6.02 x 1023atoms/mol.


 * a) 1.008E-05 m/s
 * b) 1.108E-05 m/s
 * c) 1.219E-05 m/s
 * d) 1.341E-05 m/s
 * e) 1.475E-05 m/s

2) Imagine a substance could be made into a very hot filament. Suppose the resitance is 4.08 &Omega; at a temperature of 26&deg;C and that the temperature coefficient of expansion is 4.800E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 388 &deg;C?


 * a) 1.064E+01 &Omega;
 * b) 1.117E+01 &Omega;
 * c) 1.173E+01 &Omega;
 * d) 1.231E+01 &Omega;
 * e) 1.293E+01 &Omega;

3) What is consumer cost to operate one 77&minus;W incandescent bulb for 12 hours per day for 1 year (365 days) if the cost of electricity is $0.124 per kilowatt-hour?


 * a) $3.142E+01
 * b) $3.456E+01
 * c) $3.802E+01
 * d) $4.182E+01
 * e) $4.600E+01

4) A device requires consumes 72 W of power and requires 11.7 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * a) 1.519E+06 A/m2
 * b) 1.671E+06 A/m2
 * c) 1.838E+06 A/m2
 * d) 2.022E+06 A/m2
 * e) 2.224E+06 A/m2


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Key: A0
1) Imagine a substance could be made into a very hot filament. Suppose the resitance is 3.64 &Omega; at a temperature of 82&deg;C and that the temperature coefficient of expansion is 4.530E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 390 &deg;C?


 * -a) 7.532E+00 &Omega;
 * -b) 7.908E+00 &Omega;
 * -c) 8.303E+00 &Omega;
 * +d) 8.719E+00 &Omega;
 * -e) 9.155E+00 &Omega;

2) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=27 C  and $$\tau=$$0.0154 s. What is the current at $$t=$$0.0177 s?


 * -a) 4.591E+02 A
 * -b) 5.050E+02 A
 * +c) 5.555E+02 A
 * -d) 6.111E+02 A
 * -e) 6.722E+02 A

3) Calculate the drift speed of electrons in a copper wire with a diameter of 5.19 mm carrying a 18.2 A current, given that there is one free electron per copper atom. The density of copper is 8.80 x 103kg/m3 and the atomic mass of copper is 63.54 g/mol. Avagadro's number is 6.02 x 1023atoms/mol.


 * -a) 5.321E-05 m/s
 * -b) 5.853E-05 m/s
 * +c) 6.439E-05 m/s
 * -d) 7.083E-05 m/s
 * -e) 7.791E-05 m/s

4) Calculate the resistance of a 12-gauge copper wire that is 81 m long and carries a current of 32 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * -a) 3.737E-01 &Omega;
 * +b) 4.111E-01 &Omega;
 * -c) 4.522E-01 &Omega;
 * -d) 4.975E-01 &Omega;
 * -e) 5.472E-01 &Omega;

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Key: A1
1) Imagine a substance could be made into a very hot filament. Suppose the resitance is 2.89 &Omega; at a temperature of 89&deg;C and that the temperature coefficient of expansion is 5.340E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 566 &deg;C?


 * -a) 9.763E+00 &Omega;
 * +b) 1.025E+01 &Omega;
 * -c) 1.076E+01 &Omega;
 * -d) 1.130E+01 &Omega;
 * -e) 1.187E+01 &Omega;

2) Calculate the resistance of a 12-gauge copper wire that is 90 m long and carries a current of 34 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * -a) 3.432E-01 &Omega;
 * -b) 3.775E-01 &Omega;
 * -c) 4.153E-01 &Omega;
 * +d) 4.568E-01 &Omega;
 * -e) 5.025E-01 &Omega;

3) Calculate the drift speed of electrons in a copper wire with a diameter of 4.38 mm carrying a 5.79 A current, given that there is one free electron per copper atom. The density of copper is 8.80 x 103kg/m3 and the atomic mass of copper is 63.54 g/mol. Avagadro's number is 6.02 x 1023atoms/mol.


 * -a) 2.615E-05 m/s
 * +b) 2.876E-05 m/s
 * -c) 3.164E-05 m/s
 * -d) 3.480E-05 m/s
 * -e) 3.828E-05 m/s

4) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=91 C  and $$\tau=$$0.0156 s. What is the current at $$t=$$0.0131 s?


 * -a) 2.082E+03 A
 * -b) 2.290E+03 A
 * +c) 2.519E+03 A
 * -d) 2.771E+03 A
 * -e) 3.048E+03 A

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Key: A2
1) Imagine a substance could be made into a very hot filament. Suppose the resitance is 6.74 &Omega; at a temperature of 89&deg;C and that the temperature coefficient of expansion is 4.990E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 366 &deg;C?


 * -a) 1.529E+01 &Omega;
 * +b) 1.606E+01 &Omega;
 * -c) 1.686E+01 &Omega;
 * -d) 1.770E+01 &Omega;
 * -e) 1.859E+01 &Omega;

2) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=58 C  and $$\tau=$$0.0249 s. What is the current at $$t=$$0.0191 s?


 * -a) 8.127E+02 A
 * -b) 8.939E+02 A
 * -c) 9.833E+02 A
 * +d) 1.082E+03 A
 * -e) 1.190E+03 A

3) Calculate the drift speed of electrons in a copper wire with a diameter of 5.82 mm carrying a 9.11 A current, given that there is one free electron per copper atom. The density of copper is 8.80 x 103kg/m3 and the atomic mass of copper is 63.54 g/mol. Avagadro's number is 6.02 x 1023atoms/mol.


 * -a) 1.926E-05 m/s
 * -b) 2.118E-05 m/s
 * -c) 2.330E-05 m/s
 * +d) 2.563E-05 m/s
 * -e) 2.819E-05 m/s

4) Calculate the resistance of a 12-gauge copper wire that is 52 m long and carries a current of 99 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * -a) 1.983E-01 &Omega;
 * -b) 2.181E-01 &Omega;
 * -c) 2.399E-01 &Omega;
 * +d) 2.639E-01 &Omega;
 * -e) 2.903E-01 &Omega;

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Key: B0
1) A make-believe metal has a density of 1.050E+04 kg/m3 and an atomic mass of 58.8 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * +a) 1.075E+29 e&minus;/m3
 * -b) 1.183E+29 e&minus;/m3
 * -c) 1.301E+29 e&minus;/m3
 * -d) 1.431E+29 e&minus;/m3
 * -e) 1.574E+29 e&minus;/m3

2) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=42 C  and $$\tau=$$0.0166 s. What is the current at $$t=$$0.0156 s?


 * +a) 9.886E+02 A
 * -b) 1.087E+03 A
 * -c) 1.196E+03 A
 * -d) 1.316E+03 A
 * -e) 1.447E+03 A

3) A device requires consumes 176 W of power and requires 11.9 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * +a) 2.262E+06 A/m2
 * -b) 2.489E+06 A/m2
 * -c) 2.737E+06 A/m2
 * -d) 3.011E+06 A/m2
 * -e) 3.312E+06 A/m2

4) Calculate the electric field in a 12-gauge copper wire that is 13 m long and carries a current of 59 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * -a) 2.250E-04 V/m
 * -b) 2.475E-04 V/m
 * -c) 2.722E-04 V/m
 * +d) 2.995E-04 V/m
 * -e) 3.294E-04 V/m

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Key: B1
1) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=97 C  and $$\tau=$$0.0132 s. What is the current at $$t=$$0.0225 s?


 * +a) 1.336E+03 A
 * -b) 1.470E+03 A
 * -c) 1.617E+03 A
 * -d) 1.779E+03 A
 * -e) 1.957E+03 A

2) A make-believe metal has a density of 1.480E+04 kg/m3 and an atomic mass of 73.3 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * -a) 1.105E+29 e&minus;/m3
 * +b) 1.215E+29 e&minus;/m3
 * -c) 1.337E+29 e&minus;/m3
 * -d) 1.471E+29 e&minus;/m3
 * -e) 1.618E+29 e&minus;/m3

3) Calculate the electric field in a 12-gauge copper wire that is 64 m long and carries a current of 76 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * -a) 2.635E-04 V/m
 * -b) 2.898E-04 V/m
 * -c) 3.188E-04 V/m
 * -d) 3.507E-04 V/m
 * +e) 3.857E-04 V/m

4) A device requires consumes 126 W of power and requires 1.11 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * +a) 2.110E+05 A/m2
 * -b) 2.321E+05 A/m2
 * -c) 2.553E+05 A/m2
 * -d) 2.809E+05 A/m2
 * -e) 3.090E+05 A/m2

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Key: B2
1) A device requires consumes 142 W of power and requires 12.1 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * +a) 2.300E+06 A/m2
 * -b) 2.530E+06 A/m2
 * -c) 2.783E+06 A/m2
 * -d) 3.062E+06 A/m2
 * -e) 3.368E+06 A/m2

2) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=30 C  and $$\tau=$$0.0178 s. What is the current at $$t=$$0.0161 s?


 * -a) 5.125E+02 A
 * -b) 5.638E+02 A
 * -c) 6.201E+02 A
 * +d) 6.822E+02 A
 * -e) 7.504E+02 A

3) A make-believe metal has a density of 1.300E+04 kg/m3 and an atomic mass of 75.7 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * -a) 9.398E+28 e&minus;/m3
 * +b) 1.034E+29 e&minus;/m3
 * -c) 1.137E+29 e&minus;/m3
 * -d) 1.251E+29 e&minus;/m3
 * -e) 1.376E+29 e&minus;/m3

4) Calculate the electric field in a 12-gauge copper wire that is 15 m long and carries a current of 85 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * -a) 2.947E-04 V/m
 * -b) 3.241E-04 V/m
 * -c) 3.565E-04 V/m
 * -d) 3.922E-04 V/m
 * +e) 4.314E-04 V/m

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Key: C0
1) Imagine a substance could be made into a very hot filament. Suppose the resitance is 6.06 &Omega; at a temperature of 80&deg;C and that the temperature coefficient of expansion is 4.290E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 330 &deg;C?


 * -a) 1.196E+01 &Omega;
 * +b) 1.256E+01 &Omega;
 * -c) 1.319E+01 &Omega;
 * -d) 1.385E+01 &Omega;
 * -e) 1.454E+01 &Omega;

2) A make-believe metal has a density of 1.050E+04 kg/m3 and an atomic mass of 58.8 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * +a) 1.075E+29 e&minus;/m3
 * -b) 1.183E+29 e&minus;/m3
 * -c) 1.301E+29 e&minus;/m3
 * -d) 1.431E+29 e&minus;/m3
 * -e) 1.574E+29 e&minus;/m3

3) Calculate the resistance of a 12-gauge copper wire that is 86 m long and carries a current of 97 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * +a) 4.365E-01 &Omega;
 * -b) 4.801E-01 &Omega;
 * -c) 5.282E-01 &Omega;
 * -d) 5.810E-01 &Omega;
 * -e) 6.391E-01 &Omega;

4) Calculate the drift speed of electrons in a copper wire with a diameter of 5.33 mm carrying a 5.1 A current, given that there is one free electron per copper atom. The density of copper is 8.80 x 103kg/m3 and the atomic mass of copper is 63.54 g/mol. Avagadro's number is 6.02 x 1023atoms/mol.


 * +a) 1.711E-05 m/s
 * -b) 1.882E-05 m/s
 * -c) 2.070E-05 m/s
 * -d) 2.277E-05 m/s
 * -e) 2.505E-05 m/s

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Key: C1
1) Imagine a substance could be made into a very hot filament. Suppose the resitance is 6.06 &Omega; at a temperature of 80&deg;C and that the temperature coefficient of expansion is 4.290E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 330 &deg;C?


 * -a) 1.196E+01 &Omega;
 * +b) 1.256E+01 &Omega;
 * -c) 1.319E+01 &Omega;
 * -d) 1.385E+01 &Omega;
 * -e) 1.454E+01 &Omega;

2) A make-believe metal has a density of 1.300E+04 kg/m3 and an atomic mass of 75.7 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * -a) 9.398E+28 e&minus;/m3
 * +b) 1.034E+29 e&minus;/m3
 * -c) 1.137E+29 e&minus;/m3
 * -d) 1.251E+29 e&minus;/m3
 * -e) 1.376E+29 e&minus;/m3

3) Calculate the drift speed of electrons in a copper wire with a diameter of 2.72 mm carrying a 16.2 A current, given that there is one free electron per copper atom. The density of copper is 8.80 x 103kg/m3 and the atomic mass of copper is 63.54 g/mol. Avagadro's number is 6.02 x 1023atoms/mol.


 * +a) 2.087E-04 m/s
 * -b) 2.295E-04 m/s
 * -c) 2.525E-04 m/s
 * -d) 2.777E-04 m/s
 * -e) 3.055E-04 m/s

4) Calculate the resistance of a 12-gauge copper wire that is 19 m long and carries a current of 59 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * -a) 7.970E-02 &Omega;
 * -b) 8.767E-02 &Omega;
 * +c) 9.644E-02 &Omega;
 * -d) 1.061E-01 &Omega;
 * -e) 1.167E-01 &Omega;

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Key: C2
1) A make-believe metal has a density of 1.180E+04 kg/m3 and an atomic mass of 121.0 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * -a) 4.010E+28 e&minus;/m3
 * -b) 4.411E+28 e&minus;/m3
 * -c) 4.852E+28 e&minus;/m3
 * -d) 5.337E+28 e&minus;/m3
 * +e) 5.871E+28 e&minus;/m3

2) Calculate the resistance of a 12-gauge copper wire that is 14 m long and carries a current of 38 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * -a) 5.873E-02 &Omega;
 * -b) 6.460E-02 &Omega;
 * +c) 7.106E-02 &Omega;
 * -d) 7.816E-02 &Omega;
 * -e) 8.598E-02 &Omega;

3) Calculate the drift speed of electrons in a copper wire with a diameter of 3.33 mm carrying a 13.8 A current, given that there is one free electron per copper atom. The density of copper is 8.80 x 103kg/m3 and the atomic mass of copper is 63.54 g/mol. Avagadro's number is 6.02 x 1023atoms/mol.


 * -a) 8.910E-05 m/s
 * -b) 9.801E-05 m/s
 * -c) 1.078E-04 m/s
 * +d) 1.186E-04 m/s
 * -e) 1.305E-04 m/s

4) Imagine a substance could be made into a very hot filament. Suppose the resitance is 1.95 &Omega; at a temperature of 96&deg;C and that the temperature coefficient of expansion is 4.400E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 469 &deg;C?


 * -a) 4.449E+00 &Omega;
 * -b) 4.672E+00 &Omega;
 * -c) 4.905E+00 &Omega;
 * +d) 5.150E+00 &Omega;
 * -e) 5.408E+00 &Omega;

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Key: D0
1) A device requires consumes 88 W of power and requires 11.3 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * -a) 1.467E+06 A/m2
 * -b) 1.614E+06 A/m2
 * -c) 1.775E+06 A/m2
 * -d) 1.953E+06 A/m2
 * +e) 2.148E+06 A/m2

2) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=30 C  and $$\tau=$$0.0178 s. What is the current at $$t=$$0.0161 s?


 * -a) 5.125E+02 A
 * -b) 5.638E+02 A
 * -c) 6.201E+02 A
 * +d) 6.822E+02 A
 * -e) 7.504E+02 A

3) A make-believe metal has a density of 1.050E+04 kg/m3 and an atomic mass of 58.8 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * +a) 1.075E+29 e&minus;/m3
 * -b) 1.183E+29 e&minus;/m3
 * -c) 1.301E+29 e&minus;/m3
 * -d) 1.431E+29 e&minus;/m3
 * -e) 1.574E+29 e&minus;/m3

4) What is the average current involved when a truck battery sets in motion 572 C of charge in 3.33 s while starting an engine?


 * -a) 1.173E+02 A
 * -b) 1.291E+02 A
 * -c) 1.420E+02 A
 * -d) 1.562E+02 A
 * +e) 1.718E+02 A

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Key: D1
1) What is the average current involved when a truck battery sets in motion 760 C of charge in 5.35 s while starting an engine?


 * -a) 1.291E+02 A
 * +b) 1.421E+02 A
 * -c) 1.563E+02 A
 * -d) 1.719E+02 A
 * -e) 1.891E+02 A

2) A make-believe metal has a density of 1.050E+04 kg/m3 and an atomic mass of 58.8 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * +a) 1.075E+29 e&minus;/m3
 * -b) 1.183E+29 e&minus;/m3
 * -c) 1.301E+29 e&minus;/m3
 * -d) 1.431E+29 e&minus;/m3
 * -e) 1.574E+29 e&minus;/m3

3) A device requires consumes 73 W of power and requires 9.14 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * -a) 1.187E+06 A/m2
 * -b) 1.306E+06 A/m2
 * -c) 1.436E+06 A/m2
 * -d) 1.580E+06 A/m2
 * +e) 1.738E+06 A/m2

4) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=30 C  and $$\tau=$$0.0178 s. What is the current at $$t=$$0.0161 s?


 * -a) 5.125E+02 A
 * -b) 5.638E+02 A
 * -c) 6.201E+02 A
 * +d) 6.822E+02 A
 * -e) 7.504E+02 A

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Key: D2
1) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=27 C  and $$\tau=$$0.0154 s. What is the current at $$t=$$0.0177 s?


 * -a) 4.591E+02 A
 * -b) 5.050E+02 A
 * +c) 5.555E+02 A
 * -d) 6.111E+02 A
 * -e) 6.722E+02 A

2) What is the average current involved when a truck battery sets in motion 659 C of charge in 5.48 s while starting an engine?


 * -a) 8.214E+01 A
 * -b) 9.035E+01 A
 * -c) 9.938E+01 A
 * -d) 1.093E+02 A
 * +e) 1.203E+02 A

3) A make-believe metal has a density of 8.690E+03 kg/m3 and an atomic mass of 48.4 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * +a) 1.081E+29 e&minus;/m3
 * -b) 1.189E+29 e&minus;/m3
 * -c) 1.308E+29 e&minus;/m3
 * -d) 1.439E+29 e&minus;/m3
 * -e) 1.582E+29 e&minus;/m3

4) A device requires consumes 196 W of power and requires 2.4 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * +a) 4.563E+05 A/m2
 * -b) 5.019E+05 A/m2
 * -c) 5.521E+05 A/m2
 * -d) 6.073E+05 A/m2
 * -e) 6.680E+05 A/m2

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Key: E0
1) A DC winch moter draws 29 amps at 153 volts as it lifts a 4.780E+03 N weight at a constant speed of 0.691 m/s. Assuming that all the electrical power is either converted into gravitational potential energy or ohmically heats the motor's coils, calculate the coil's resistance.


 * -a) 1.226E+00 &Omega;
 * +b) 1.348E+00 &Omega;
 * -c) 1.483E+00 &Omega;
 * -d) 1.632E+00 &Omega;
 * -e) 1.795E+00 &Omega;

2) What is consumer cost to operate one 76&minus;W incandescent bulb for 9 hours per day for 1 year (365 days) if the cost of electricity is $0.144 per kilowatt-hour?


 * +a) $3.595E+01
 * -b) $3.955E+01
 * -c) $4.350E+01
 * -d) $4.785E+01
 * -e) $5.264E+01

3) A device requires consumes 156 W of power and requires 5.42 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * -a) 7.742E+05 A/m2
 * -b) 8.516E+05 A/m2
 * -c) 9.367E+05 A/m2
 * +d) 1.030E+06 A/m2
 * -e) 1.133E+06 A/m2

4) Calculate the electric field in a 12-gauge copper wire that is 48 m long and carries a current of 63 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * +a) 3.198E-04 V/m
 * -b) 3.517E-04 V/m
 * -c) 3.869E-04 V/m
 * -d) 4.256E-04 V/m
 * -e) 4.682E-04 V/m

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Key: E1
1) What is consumer cost to operate one 74&minus;W incandescent bulb for 9 hours per day for 1 year (365 days) if the cost of electricity is $0.119 per kilowatt-hour?


 * -a) $1.976E+01
 * -b) $2.173E+01
 * -c) $2.391E+01
 * -d) $2.630E+01
 * +e) $2.893E+01

2) A device requires consumes 166 W of power and requires 9.99 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * -a) 1.570E+06 A/m2
 * -b) 1.727E+06 A/m2
 * +c) 1.899E+06 A/m2
 * -d) 2.089E+06 A/m2
 * -e) 2.298E+06 A/m2

3) A DC winch moter draws 17 amps at 187 volts as it lifts a 5.600E+03 N weight at a constant speed of 0.381 m/s. Assuming that all the electrical power is either converted into gravitational potential energy or ohmically heats the motor's coils, calculate the coil's resistance.


 * -a) 2.471E+00 &Omega;
 * -b) 2.718E+00 &Omega;
 * -c) 2.990E+00 &Omega;
 * -d) 3.288E+00 &Omega;
 * +e) 3.617E+00 &Omega;

4) Calculate the electric field in a 12-gauge copper wire that is 78 m long and carries a current of 24 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * +a) 1.218E-04 V/m
 * -b) 1.340E-04 V/m
 * -c) 1.474E-04 V/m
 * -d) 1.621E-04 V/m
 * -e) 1.783E-04 V/m

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Key: E2
1) A device requires consumes 166 W of power and requires 9.99 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * -a) 1.570E+06 A/m2
 * -b) 1.727E+06 A/m2
 * +c) 1.899E+06 A/m2
 * -d) 2.089E+06 A/m2
 * -e) 2.298E+06 A/m2

2) What is consumer cost to operate one 102&minus;W incandescent bulb for 6 hours per day for 1 year (365 days) if the cost of electricity is $0.127 per kilowatt-hour?


 * -a) $2.131E+01
 * -b) $2.345E+01
 * -c) $2.579E+01
 * +d) $2.837E+01
 * -e) $3.121E+01

3) A DC winch moter draws 27 amps at 143 volts as it lifts a 5.060E+03 N weight at a constant speed of 0.623 m/s. Assuming that all the electrical power is either converted into gravitational potential energy or ohmically heats the motor's coils, calculate the coil's resistance.


 * -a) 8.033E-01 &Omega;
 * -b) 8.837E-01 &Omega;
 * +c) 9.720E-01 &Omega;
 * -d) 1.069E+00 &Omega;
 * -e) 1.176E+00 &Omega;

4) Calculate the electric field in a 12-gauge copper wire that is 18 m long and carries a current of 22 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * +a) 1.117E-04 V/m
 * -b) 1.228E-04 V/m
 * -c) 1.351E-04 V/m
 * -d) 1.486E-04 V/m
 * -e) 1.635E-04 V/m

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Key: F0
1) What is the average current involved when a truck battery sets in motion 682 C of charge in 5.29 s while starting an engine?


 * -a) 1.065E+02 A
 * -b) 1.172E+02 A
 * +c) 1.289E+02 A
 * -d) 1.418E+02 A
 * -e) 1.560E+02 A

2) A device requires consumes 185 W of power and requires 10.1 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * +a) 1.920E+06 A/m2
 * -b) 2.112E+06 A/m2
 * -c) 2.323E+06 A/m2
 * -d) 2.556E+06 A/m2
 * -e) 2.811E+06 A/m2

3) Calculate the resistance of a 12-gauge copper wire that is 48 m long and carries a current of 50 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * -a) 2.215E-01 &Omega;
 * +b) 2.436E-01 &Omega;
 * -c) 2.680E-01 &Omega;
 * -d) 2.948E-01 &Omega;
 * -e) 3.243E-01 &Omega;

4) A make-believe metal has a density of 1.300E+04 kg/m3 and an atomic mass of 75.7 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * -a) 9.398E+28 e&minus;/m3
 * +b) 1.034E+29 e&minus;/m3
 * -c) 1.137E+29 e&minus;/m3
 * -d) 1.251E+29 e&minus;/m3
 * -e) 1.376E+29 e&minus;/m3

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Key: F1
1) Calculate the resistance of a 12-gauge copper wire that is 69 m long and carries a current of 98 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * -a) 2.631E-01 &Omega;
 * -b) 2.894E-01 &Omega;
 * -c) 3.184E-01 &Omega;
 * +d) 3.502E-01 &Omega;
 * -e) 3.852E-01 &Omega;

2) A make-believe metal has a density of 3.530E+03 kg/m3 and an atomic mass of 10.5 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * -a) 1.673E+29 e&minus;/m3
 * -b) 1.840E+29 e&minus;/m3
 * +c) 2.024E+29 e&minus;/m3
 * -d) 2.226E+29 e&minus;/m3
 * -e) 2.449E+29 e&minus;/m3

3) What is the average current involved when a truck battery sets in motion 728 C of charge in 3.94 s while starting an engine?


 * +a) 1.848E+02 A
 * -b) 2.032E+02 A
 * -c) 2.236E+02 A
 * -d) 2.459E+02 A
 * -e) 2.705E+02 A

4) A device requires consumes 177 W of power and requires 6.82 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * -a) 9.741E+05 A/m2
 * -b) 1.072E+06 A/m2
 * -c) 1.179E+06 A/m2
 * +d) 1.297E+06 A/m2
 * -e) 1.426E+06 A/m2

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Key: F2
1) A make-believe metal has a density of 3.470E+03 kg/m3 and an atomic mass of 33.8 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * +a) 6.180E+28 e&minus;/m3
 * -b) 6.798E+28 e&minus;/m3
 * -c) 7.478E+28 e&minus;/m3
 * -d) 8.226E+28 e&minus;/m3
 * -e) 9.049E+28 e&minus;/m3

2) Calculate the resistance of a 12-gauge copper wire that is 14 m long and carries a current of 38 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * -a) 5.873E-02 &Omega;
 * -b) 6.460E-02 &Omega;
 * +c) 7.106E-02 &Omega;
 * -d) 7.816E-02 &Omega;
 * -e) 8.598E-02 &Omega;

3) What is the average current involved when a truck battery sets in motion 618 C of charge in 2.28 s while starting an engine?


 * -a) 2.240E+02 A
 * -b) 2.464E+02 A
 * +c) 2.711E+02 A
 * -d) 2.982E+02 A
 * -e) 3.280E+02 A

4) A device requires consumes 103 W of power and requires 6.3 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * -a) 8.999E+05 A/m2
 * -b) 9.899E+05 A/m2
 * -c) 1.089E+06 A/m2
 * +d) 1.198E+06 A/m2
 * -e) 1.317E+06 A/m2

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Key: G0
1) A make-believe metal has a density of 1.480E+04 kg/m3 and an atomic mass of 196.0 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * +a) 4.546E+28 e&minus;/m3
 * -b) 5.000E+28 e&minus;/m3
 * -c) 5.500E+28 e&minus;/m3
 * -d) 6.050E+28 e&minus;/m3
 * -e) 6.655E+28 e&minus;/m3

2) Calculate the electric field in a 12-gauge copper wire that is 99 m long and carries a current of 71 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * +a) 3.604E-04 V/m
 * -b) 3.964E-04 V/m
 * -c) 4.360E-04 V/m
 * -d) 4.796E-04 V/m
 * -e) 5.276E-04 V/m

3) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=42 C  and $$\tau=$$0.0166 s. What is the current at $$t=$$0.0156 s?


 * +a) 9.886E+02 A
 * -b) 1.087E+03 A
 * -c) 1.196E+03 A
 * -d) 1.316E+03 A
 * -e) 1.447E+03 A

4) A DC winch moter draws 23 amps at 170 volts as it lifts a 5.200E+03 N weight at a constant speed of 0.662 m/s. Assuming that all the electrical power is either converted into gravitational potential energy or ohmically heats the motor's coils, calculate the coil's resistance.


 * -a) 7.305E-01 &Omega;
 * -b) 8.036E-01 &Omega;
 * +c) 8.839E-01 &Omega;
 * -d) 9.723E-01 &Omega;
 * -e) 1.070E+00 &Omega;

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Key: G1
1) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=24 C  and $$\tau=$$0.0248 s. What is the current at $$t=$$0.0122 s?


 * -a) 4.042E+02 A
 * -b) 4.446E+02 A
 * -c) 4.890E+02 A
 * -d) 5.379E+02 A
 * +e) 5.917E+02 A

2) Calculate the electric field in a 12-gauge copper wire that is 18 m long and carries a current of 22 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * +a) 1.117E-04 V/m
 * -b) 1.228E-04 V/m
 * -c) 1.351E-04 V/m
 * -d) 1.486E-04 V/m
 * -e) 1.635E-04 V/m

3) A make-believe metal has a density of 1.580E+04 kg/m3 and an atomic mass of 41.5 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * +a) 2.292E+29 e&minus;/m3
 * -b) 2.521E+29 e&minus;/m3
 * -c) 2.773E+29 e&minus;/m3
 * -d) 3.051E+29 e&minus;/m3
 * -e) 3.356E+29 e&minus;/m3

4) A DC winch moter draws 13 amps at 159 volts as it lifts a 4.270E+03 N weight at a constant speed of 0.357 m/s. Assuming that all the electrical power is either converted into gravitational potential energy or ohmically heats the motor's coils, calculate the coil's resistance.


 * +a) 3.211E+00 &Omega;
 * -b) 3.532E+00 &Omega;
 * -c) 3.885E+00 &Omega;
 * -d) 4.273E+00 &Omega;
 * -e) 4.701E+00 &Omega;

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Key: G2
1) Calculate the electric field in a 12-gauge copper wire that is 25 m long and carries a current of 43 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * +a) 2.182E-04 V/m
 * -b) 2.401E-04 V/m
 * -c) 2.641E-04 V/m
 * -d) 2.905E-04 V/m
 * -e) 3.195E-04 V/m

2) A DC winch moter draws 18 amps at 126 volts as it lifts a 5.830E+03 N weight at a constant speed of 0.26 m/s. Assuming that all the electrical power is either converted into gravitational potential energy or ohmically heats the motor's coils, calculate the coil's resistance.


 * -a) 1.919E+00 &Omega;
 * -b) 2.111E+00 &Omega;
 * +c) 2.322E+00 &Omega;
 * -d) 2.554E+00 &Omega;
 * -e) 2.809E+00 &Omega;

3) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=91 C  and $$\tau=$$0.0156 s. What is the current at $$t=$$0.0131 s?


 * -a) 2.082E+03 A
 * -b) 2.290E+03 A
 * +c) 2.519E+03 A
 * -d) 2.771E+03 A
 * -e) 3.048E+03 A

4) A make-believe metal has a density of 1.480E+04 kg/m3 and an atomic mass of 73.3 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * -a) 1.105E+29 e&minus;/m3
 * +b) 1.215E+29 e&minus;/m3
 * -c) 1.337E+29 e&minus;/m3
 * -d) 1.471E+29 e&minus;/m3
 * -e) 1.618E+29 e&minus;/m3

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Key: H0
1) A make-believe metal has a density of 1.050E+04 kg/m3 and an atomic mass of 58.8 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * +a) 1.075E+29 e&minus;/m3
 * -b) 1.183E+29 e&minus;/m3
 * -c) 1.301E+29 e&minus;/m3
 * -d) 1.431E+29 e&minus;/m3
 * -e) 1.574E+29 e&minus;/m3

2) Calculate the electric field in a 12-gauge copper wire that is 48 m long and carries a current of 63 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * +a) 3.198E-04 V/m
 * -b) 3.517E-04 V/m
 * -c) 3.869E-04 V/m
 * -d) 4.256E-04 V/m
 * -e) 4.682E-04 V/m

3) A device requires consumes 72 W of power and requires 11.7 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * -a) 1.519E+06 A/m2
 * -b) 1.671E+06 A/m2
 * -c) 1.838E+06 A/m2
 * -d) 2.022E+06 A/m2
 * +e) 2.224E+06 A/m2

4) A DC winch moter draws 20 amps at 157 volts as it lifts a 5.270E+03 N weight at a constant speed of 0.403 m/s. Assuming that all the electrical power is either converted into gravitational potential energy or ohmically heats the motor's coils, calculate the coil's resistance.


 * +a) 2.540E+00 &Omega;
 * -b) 2.795E+00 &Omega;
 * -c) 3.074E+00 &Omega;
 * -d) 3.381E+00 &Omega;
 * -e) 3.720E+00 &Omega;

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Key: H1
1) A make-believe metal has a density of 5.880E+03 kg/m3 and an atomic mass of 87.4 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * -a) 3.347E+28 e&minus;/m3
 * -b) 3.682E+28 e&minus;/m3
 * +c) 4.050E+28 e&minus;/m3
 * -d) 4.455E+28 e&minus;/m3
 * -e) 4.901E+28 e&minus;/m3

2) Calculate the electric field in a 12-gauge copper wire that is 23 m long and carries a current of 64 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * -a) 2.953E-04 V/m
 * +b) 3.248E-04 V/m
 * -c) 3.573E-04 V/m
 * -d) 3.930E-04 V/m
 * -e) 4.324E-04 V/m

3) A device requires consumes 84 W of power and requires 3.66 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * -a) 5.751E+05 A/m2
 * -b) 6.326E+05 A/m2
 * +c) 6.958E+05 A/m2
 * -d) 7.654E+05 A/m2
 * -e) 8.419E+05 A/m2

4) A DC winch moter draws 25 amps at 128 volts as it lifts a 5.710E+03 N weight at a constant speed of 0.449 m/s. Assuming that all the electrical power is either converted into gravitational potential energy or ohmically heats the motor's coils, calculate the coil's resistance.


 * -a) 8.413E-01 &Omega;
 * -b) 9.254E-01 &Omega;
 * +c) 1.018E+00 &Omega;
 * -d) 1.120E+00 &Omega;
 * -e) 1.232E+00 &Omega;

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Key: H2
1) A DC winch moter draws 24 amps at 159 volts as it lifts a 4.120E+03 N weight at a constant speed of 0.657 m/s. Assuming that all the electrical power is either converted into gravitational potential energy or ohmically heats the motor's coils, calculate the coil's resistance.


 * -a) 1.447E+00 &Omega;
 * -b) 1.591E+00 &Omega;
 * -c) 1.751E+00 &Omega;
 * +d) 1.926E+00 &Omega;
 * -e) 2.118E+00 &Omega;

2) A device requires consumes 81 W of power and requires 2.34 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * -a) 3.342E+05 A/m2
 * -b) 3.677E+05 A/m2
 * -c) 4.044E+05 A/m2
 * +d) 4.449E+05 A/m2
 * -e) 4.894E+05 A/m2

3) A make-believe metal has a density of 1.180E+04 kg/m3 and an atomic mass of 121.0 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * -a) 4.010E+28 e&minus;/m3
 * -b) 4.411E+28 e&minus;/m3
 * -c) 4.852E+28 e&minus;/m3
 * -d) 5.337E+28 e&minus;/m3
 * +e) 5.871E+28 e&minus;/m3

4) Calculate the electric field in a 12-gauge copper wire that is 99 m long and carries a current of 71 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * +a) 3.604E-04 V/m
 * -b) 3.964E-04 V/m
 * -c) 4.360E-04 V/m
 * -d) 4.796E-04 V/m
 * -e) 5.276E-04 V/m

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Key: I0
1) What is consumer cost to operate one 87&minus;W incandescent bulb for 11 hours per day for 1 year (365 days) if the cost of electricity is $0.117 per kilowatt-hour?


 * -a) $2.791E+01
 * -b) $3.071E+01
 * -c) $3.378E+01
 * -d) $3.715E+01
 * +e) $4.087E+01

2) Calculate the electric field in a 12-gauge copper wire that is 16 m long and carries a current of 58 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * -a) 2.212E-04 V/m
 * -b) 2.433E-04 V/m
 * -c) 2.676E-04 V/m
 * +d) 2.944E-04 V/m
 * -e) 3.238E-04 V/m

3) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=85 C  and $$\tau=$$0.021 s. What is the current at $$t=$$0.0128 s?


 * -a) 1.503E+03 A
 * -b) 1.653E+03 A
 * -c) 1.818E+03 A
 * -d) 2.000E+03 A
 * +e) 2.200E+03 A

4) Imagine a substance could be made into a very hot filament. Suppose the resitance is 4.08 &Omega; at a temperature of 26&deg;C and that the temperature coefficient of expansion is 4.800E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 388 &deg;C?


 * -a) 1.064E+01 &Omega;
 * +b) 1.117E+01 &Omega;
 * -c) 1.173E+01 &Omega;
 * -d) 1.231E+01 &Omega;
 * -e) 1.293E+01 &Omega;

Click these links for the keys:

Key: I1
1) Imagine a substance could be made into a very hot filament. Suppose the resitance is 6.06 &Omega; at a temperature of 80&deg;C and that the temperature coefficient of expansion is 4.290E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 330 &deg;C?


 * -a) 1.196E+01 &Omega;
 * +b) 1.256E+01 &Omega;
 * -c) 1.319E+01 &Omega;
 * -d) 1.385E+01 &Omega;
 * -e) 1.454E+01 &Omega;

2) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=63 C  and $$\tau=$$0.0149 s. What is the current at $$t=$$0.0172 s?


 * -a) 1.212E+03 A
 * +b) 1.333E+03 A
 * -c) 1.466E+03 A
 * -d) 1.613E+03 A
 * -e) 1.774E+03 A

3) What is consumer cost to operate one 102&minus;W incandescent bulb for 6 hours per day for 1 year (365 days) if the cost of electricity is $0.127 per kilowatt-hour?


 * -a) $2.131E+01
 * -b) $2.345E+01
 * -c) $2.579E+01
 * +d) $2.837E+01
 * -e) $3.121E+01

4) Calculate the electric field in a 12-gauge copper wire that is 62 m long and carries a current of 52 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * -a) 1.983E-04 V/m
 * -b) 2.181E-04 V/m
 * -c) 2.399E-04 V/m
 * +d) 2.639E-04 V/m
 * -e) 2.903E-04 V/m

Click these links for the keys:

Key: I2
1) Imagine a substance could be made into a very hot filament. Suppose the resitance is 6.74 &Omega; at a temperature of 89&deg;C and that the temperature coefficient of expansion is 4.990E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 366 &deg;C?


 * -a) 1.529E+01 &Omega;
 * +b) 1.606E+01 &Omega;
 * -c) 1.686E+01 &Omega;
 * -d) 1.770E+01 &Omega;
 * -e) 1.859E+01 &Omega;

2) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=18 C  and $$\tau=$$0.0169 s. What is the current at $$t=$$0.0137 s?


 * -a) 3.913E+02 A
 * -b) 4.305E+02 A
 * +c) 4.735E+02 A
 * -d) 5.209E+02 A
 * -e) 5.729E+02 A

3) What is consumer cost to operate one 74&minus;W incandescent bulb for 9 hours per day for 1 year (365 days) if the cost of electricity is $0.119 per kilowatt-hour?


 * -a) $1.976E+01
 * -b) $2.173E+01
 * -c) $2.391E+01
 * -d) $2.630E+01
 * +e) $2.893E+01

4) Calculate the electric field in a 12-gauge copper wire that is 84 m long and carries a current of 48 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * -a) 1.664E-04 V/m
 * -b) 1.830E-04 V/m
 * -c) 2.013E-04 V/m
 * -d) 2.215E-04 V/m
 * +e) 2.436E-04 V/m

Click these links for the keys:

Key: J0
1) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=97 C  and $$\tau=$$0.0132 s. What is the current at $$t=$$0.0225 s?


 * +a) 1.336E+03 A
 * -b) 1.470E+03 A
 * -c) 1.617E+03 A
 * -d) 1.779E+03 A
 * -e) 1.957E+03 A

2) Calculate the resistance of a 12-gauge copper wire that is 90 m long and carries a current of 34 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * -a) 3.432E-01 &Omega;
 * -b) 3.775E-01 &Omega;
 * -c) 4.153E-01 &Omega;
 * +d) 4.568E-01 &Omega;
 * -e) 5.025E-01 &Omega;

3) What is consumer cost to operate one 89&minus;W incandescent bulb for 10 hours per day for 1 year (365 days) if the cost of electricity is $0.141 per kilowatt-hour?


 * -a) $3.785E+01
 * -b) $4.164E+01
 * +c) $4.580E+01
 * -d) $5.038E+01
 * -e) $5.542E+01

4) A device requires consumes 72 W of power and requires 11.7 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * -a) 1.519E+06 A/m2
 * -b) 1.671E+06 A/m2
 * -c) 1.838E+06 A/m2
 * -d) 2.022E+06 A/m2
 * +e) 2.224E+06 A/m2

Click these links for the keys:

Key: J1
1) Calculate the resistance of a 12-gauge copper wire that is 10 m long and carries a current of 69 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * -a) 4.614E-02 &Omega;
 * +b) 5.076E-02 &Omega;
 * -c) 5.583E-02 &Omega;
 * -d) 6.141E-02 &Omega;
 * -e) 6.756E-02 &Omega;

2) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=42 C  and $$\tau=$$0.0166 s. What is the current at $$t=$$0.0156 s?


 * +a) 9.886E+02 A
 * -b) 1.087E+03 A
 * -c) 1.196E+03 A
 * -d) 1.316E+03 A
 * -e) 1.447E+03 A

3) A device requires consumes 103 W of power and requires 6.3 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * -a) 8.999E+05 A/m2
 * -b) 9.899E+05 A/m2
 * -c) 1.089E+06 A/m2
 * +d) 1.198E+06 A/m2
 * -e) 1.317E+06 A/m2

4) What is consumer cost to operate one 69&minus;W incandescent bulb for 7 hours per day for 1 year (365 days) if the cost of electricity is $0.117 per kilowatt-hour?


 * +a) $2.063E+01
 * -b) $2.269E+01
 * -c) $2.496E+01
 * -d) $2.745E+01
 * -e) $3.020E+01

Click these links for the keys:

Key: J2
1) A device requires consumes 103 W of power and requires 6.3 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * -a) 8.999E+05 A/m2
 * -b) 9.899E+05 A/m2
 * -c) 1.089E+06 A/m2
 * +d) 1.198E+06 A/m2
 * -e) 1.317E+06 A/m2

2) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=23 C  and $$\tau=$$0.0204 s. What is the current at $$t=$$0.0106 s?


 * -a) 6.096E+02 A
 * +b) 6.706E+02 A
 * -c) 7.376E+02 A
 * -d) 8.114E+02 A
 * -e) 8.925E+02 A

3) What is consumer cost to operate one 57&minus;W incandescent bulb for 11 hours per day for 1 year (365 days) if the cost of electricity is $0.146 per kilowatt-hour?


 * -a) $2.282E+01
 * -b) $2.510E+01
 * -c) $2.761E+01
 * -d) $3.038E+01
 * +e) $3.341E+01

4) Calculate the resistance of a 12-gauge copper wire that is 30 m long and carries a current of 31 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * -a) 1.384E-01 &Omega;
 * +b) 1.523E-01 &Omega;
 * -c) 1.675E-01 &Omega;
 * -d) 1.842E-01 &Omega;
 * -e) 2.027E-01 &Omega;

Click these links for the keys:

Key: K0
1) Calculate the electric field in a 12-gauge copper wire that is 17 m long and carries a current of 56 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * -a) 1.941E-04 V/m
 * -b) 2.135E-04 V/m
 * -c) 2.349E-04 V/m
 * -d) 2.584E-04 V/m
 * +e) 2.842E-04 V/m

2) Calculate the resistance of a 12-gauge copper wire that is 30 m long and carries a current of 31 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * -a) 1.384E-01 &Omega;
 * +b) 1.523E-01 &Omega;
 * -c) 1.675E-01 &Omega;
 * -d) 1.842E-01 &Omega;
 * -e) 2.027E-01 &Omega;

3) What is consumer cost to operate one 89&minus;W incandescent bulb for 10 hours per day for 1 year (365 days) if the cost of electricity is $0.141 per kilowatt-hour?


 * -a) $3.785E+01
 * -b) $4.164E+01
 * +c) $4.580E+01
 * -d) $5.038E+01
 * -e) $5.542E+01

4) A device requires consumes 196 W of power and requires 2.4 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * +a) 4.563E+05 A/m2
 * -b) 5.019E+05 A/m2
 * -c) 5.521E+05 A/m2
 * -d) 6.073E+05 A/m2
 * -e) 6.680E+05 A/m2

Click these links for the keys:

Key: K1
1) What is consumer cost to operate one 65&minus;W incandescent bulb for 12 hours per day for 1 year (365 days) if the cost of electricity is $0.134 per kilowatt-hour?


 * -a) $2.866E+01
 * -b) $3.153E+01
 * -c) $3.468E+01
 * +d) $3.815E+01
 * -e) $4.196E+01

2) A device requires consumes 81 W of power and requires 2.34 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * -a) 3.342E+05 A/m2
 * -b) 3.677E+05 A/m2
 * -c) 4.044E+05 A/m2
 * +d) 4.449E+05 A/m2
 * -e) 4.894E+05 A/m2

3) Calculate the resistance of a 12-gauge copper wire that is 52 m long and carries a current of 99 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * -a) 1.983E-01 &Omega;
 * -b) 2.181E-01 &Omega;
 * -c) 2.399E-01 &Omega;
 * +d) 2.639E-01 &Omega;
 * -e) 2.903E-01 &Omega;

4) Calculate the electric field in a 12-gauge copper wire that is 18 m long and carries a current of 22 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * +a) 1.117E-04 V/m
 * -b) 1.228E-04 V/m
 * -c) 1.351E-04 V/m
 * -d) 1.486E-04 V/m
 * -e) 1.635E-04 V/m

Click these links for the keys:

Key: K2
1) Calculate the electric field in a 12-gauge copper wire that is 18 m long and carries a current of 22 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * +a) 1.117E-04 V/m
 * -b) 1.228E-04 V/m
 * -c) 1.351E-04 V/m
 * -d) 1.486E-04 V/m
 * -e) 1.635E-04 V/m

2) What is consumer cost to operate one 76&minus;W incandescent bulb for 9 hours per day for 1 year (365 days) if the cost of electricity is $0.144 per kilowatt-hour?


 * +a) $3.595E+01
 * -b) $3.955E+01
 * -c) $4.350E+01
 * -d) $4.785E+01
 * -e) $5.264E+01

3) Calculate the resistance of a 12-gauge copper wire that is 11 m long and carries a current of 94 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * -a) 3.813E-02 &Omega;
 * -b) 4.195E-02 &Omega;
 * -c) 4.614E-02 &Omega;
 * -d) 5.076E-02 &Omega;
 * +e) 5.583E-02 &Omega;

4) A device requires consumes 177 W of power and requires 6.82 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * -a) 9.741E+05 A/m2
 * -b) 1.072E+06 A/m2
 * -c) 1.179E+06 A/m2
 * +d) 1.297E+06 A/m2
 * -e) 1.426E+06 A/m2

Click these links for the keys:

Key: L0
1) A device requires consumes 72 W of power and requires 11.7 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * -a) 1.519E+06 A/m2
 * -b) 1.671E+06 A/m2
 * -c) 1.838E+06 A/m2
 * -d) 2.022E+06 A/m2
 * +e) 2.224E+06 A/m2

2) What is consumer cost to operate one 102&minus;W incandescent bulb for 5 hours per day for 1 year (365 days) if the cost of electricity is $0.149 per kilowatt-hour?


 * -a) $2.292E+01
 * -b) $2.521E+01
 * +c) $2.774E+01
 * -d) $3.051E+01
 * -e) $3.356E+01

3) Imagine a substance could be made into a very hot filament. Suppose the resitance is 4.48 &Omega; at a temperature of 56&deg;C and that the temperature coefficient of expansion is 4.550E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 449 &deg;C?


 * -a) 1.028E+01 &Omega;
 * -b) 1.079E+01 &Omega;
 * -c) 1.133E+01 &Omega;
 * -d) 1.190E+01 &Omega;
 * +e) 1.249E+01 &Omega;

4) Calculate the drift speed of electrons in a copper wire with a diameter of 5.46 mm carrying a 5.05 A current, given that there is one free electron per copper atom. The density of copper is 8.80 x 103kg/m3 and the atomic mass of copper is 63.54 g/mol. Avagadro's number is 6.02 x 1023atoms/mol.


 * +a) 1.614E-05 m/s
 * -b) 1.776E-05 m/s
 * -c) 1.953E-05 m/s
 * -d) 2.149E-05 m/s
 * -e) 2.363E-05 m/s

Click these links for the keys:

Key: L1
1) What is consumer cost to operate one 73&minus;W incandescent bulb for 11 hours per day for 1 year (365 days) if the cost of electricity is $0.113 per kilowatt-hour?


 * +a) $3.312E+01
 * -b) $3.643E+01
 * -c) $4.007E+01
 * -d) $4.408E+01
 * -e) $4.849E+01

2) A device requires consumes 177 W of power and requires 6.82 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * -a) 9.741E+05 A/m2
 * -b) 1.072E+06 A/m2
 * -c) 1.179E+06 A/m2
 * +d) 1.297E+06 A/m2
 * -e) 1.426E+06 A/m2

3) Calculate the drift speed of electrons in a copper wire with a diameter of 2.17 mm carrying a 19.4 A current, given that there is one free electron per copper atom. The density of copper is 8.80 x 103kg/m3 and the atomic mass of copper is 63.54 g/mol. Avagadro's number is 6.02 x 1023atoms/mol.


 * -a) 3.569E-04 m/s
 * +b) 3.926E-04 m/s
 * -c) 4.319E-04 m/s
 * -d) 4.750E-04 m/s
 * -e) 5.226E-04 m/s

4) Imagine a substance could be made into a very hot filament. Suppose the resitance is 5.94 &Omega; at a temperature of 70&deg;C and that the temperature coefficient of expansion is 5.120E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 386 &deg;C?


 * -a) 1.279E+01 &Omega;
 * -b) 1.343E+01 &Omega;
 * -c) 1.410E+01 &Omega;
 * -d) 1.481E+01 &Omega;
 * +e) 1.555E+01 &Omega;

Click these links for the keys:

Key: L2
1) A device requires consumes 78 W of power and requires 11.3 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * -a) 1.953E+06 A/m2
 * +b) 2.148E+06 A/m2
 * -c) 2.363E+06 A/m2
 * -d) 2.599E+06 A/m2
 * -e) 2.859E+06 A/m2

2) What is consumer cost to operate one 87&minus;W incandescent bulb for 11 hours per day for 1 year (365 days) if the cost of electricity is $0.117 per kilowatt-hour?


 * -a) $2.791E+01
 * -b) $3.071E+01
 * -c) $3.378E+01
 * -d) $3.715E+01
 * +e) $4.087E+01

3) Imagine a substance could be made into a very hot filament. Suppose the resitance is 4.48 &Omega; at a temperature of 56&deg;C and that the temperature coefficient of expansion is 4.550E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 449 &deg;C?


 * -a) 1.028E+01 &Omega;
 * -b) 1.079E+01 &Omega;
 * -c) 1.133E+01 &Omega;
 * -d) 1.190E+01 &Omega;
 * +e) 1.249E+01 &Omega;

4) Calculate the drift speed of electrons in a copper wire with a diameter of 4.9 mm carrying a 6.43 A current, given that there is one free electron per copper atom. The density of copper is 8.80 x 103kg/m3 and the atomic mass of copper is 63.54 g/mol. Avagadro's number is 6.02 x 1023atoms/mol.


 * -a) 2.109E-05 m/s
 * -b) 2.320E-05 m/s
 * +c) 2.552E-05 m/s
 * -d) 2.807E-05 m/s
 * -e) 3.088E-05 m/s

Click these links for the keys:

Key: M0
1) A device requires consumes 103 W of power and requires 6.3 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * -a) 8.999E+05 A/m2
 * -b) 9.899E+05 A/m2
 * -c) 1.089E+06 A/m2
 * +d) 1.198E+06 A/m2
 * -e) 1.317E+06 A/m2

2) Calculate the electric field in a 12-gauge copper wire that is 16 m long and carries a current of 58 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * -a) 2.212E-04 V/m
 * -b) 2.433E-04 V/m
 * -c) 2.676E-04 V/m
 * +d) 2.944E-04 V/m
 * -e) 3.238E-04 V/m

3) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=11 C  and $$\tau=$$0.0162 s. What is the current at $$t=$$0.0249 s?


 * -a) 9.972E+01 A
 * -b) 1.097E+02 A
 * -c) 1.207E+02 A
 * -d) 1.327E+02 A
 * +e) 1.460E+02 A

4) What is consumer cost to operate one 59&minus;W incandescent bulb for 10 hours per day for 1 year (365 days) if the cost of electricity is $0.132 per kilowatt-hour?


 * -a) $2.584E+01
 * +b) $2.843E+01
 * -c) $3.127E+01
 * -d) $3.440E+01
 * -e) $3.784E+01

Click these links for the keys:

Key: M1
1) What is consumer cost to operate one 102&minus;W incandescent bulb for 5 hours per day for 1 year (365 days) if the cost of electricity is $0.149 per kilowatt-hour?


 * -a) $2.292E+01
 * -b) $2.521E+01
 * +c) $2.774E+01
 * -d) $3.051E+01
 * -e) $3.356E+01

2) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=18 C  and $$\tau=$$0.0169 s. What is the current at $$t=$$0.0137 s?


 * -a) 3.913E+02 A
 * -b) 4.305E+02 A
 * +c) 4.735E+02 A
 * -d) 5.209E+02 A
 * -e) 5.729E+02 A

3) Calculate the electric field in a 12-gauge copper wire that is 17 m long and carries a current of 56 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * -a) 1.941E-04 V/m
 * -b) 2.135E-04 V/m
 * -c) 2.349E-04 V/m
 * -d) 2.584E-04 V/m
 * +e) 2.842E-04 V/m

4) A device requires consumes 166 W of power and requires 9.99 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * -a) 1.570E+06 A/m2
 * -b) 1.727E+06 A/m2
 * +c) 1.899E+06 A/m2
 * -d) 2.089E+06 A/m2
 * -e) 2.298E+06 A/m2

Click these links for the keys:

Key: M2
1) What is consumer cost to operate one 102&minus;W incandescent bulb for 5 hours per day for 1 year (365 days) if the cost of electricity is $0.149 per kilowatt-hour?


 * -a) $2.292E+01
 * -b) $2.521E+01
 * +c) $2.774E+01
 * -d) $3.051E+01
 * -e) $3.356E+01

2) A device requires consumes 120 W of power and requires 4.85 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * -a) 7.620E+05 A/m2
 * -b) 8.382E+05 A/m2
 * +c) 9.221E+05 A/m2
 * -d) 1.014E+06 A/m2
 * -e) 1.116E+06 A/m2

3) Calculate the electric field in a 12-gauge copper wire that is 23 m long and carries a current of 64 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * -a) 2.953E-04 V/m
 * +b) 3.248E-04 V/m
 * -c) 3.573E-04 V/m
 * -d) 3.930E-04 V/m
 * -e) 4.324E-04 V/m

4) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=78 C  and $$\tau=$$0.0244 s. What is the current at $$t=$$0.0225 s?


 * +a) 1.271E+03 A
 * -b) 1.398E+03 A
 * -c) 1.538E+03 A
 * -d) 1.692E+03 A
 * -e) 1.861E+03 A

Click these links for the keys:

Key: N0
1) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=18 C  and $$\tau=$$0.0169 s. What is the current at $$t=$$0.0137 s?


 * -a) 3.913E+02 A
 * -b) 4.305E+02 A
 * +c) 4.735E+02 A
 * -d) 5.209E+02 A
 * -e) 5.729E+02 A

2) A make-believe metal has a density of 1.480E+04 kg/m3 and an atomic mass of 196.0 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * +a) 4.546E+28 e&minus;/m3
 * -b) 5.000E+28 e&minus;/m3
 * -c) 5.500E+28 e&minus;/m3
 * -d) 6.050E+28 e&minus;/m3
 * -e) 6.655E+28 e&minus;/m3

3) Calculate the drift speed of electrons in a copper wire with a diameter of 4.38 mm carrying a 5.79 A current, given that there is one free electron per copper atom. The density of copper is 8.80 x 103kg/m3 and the atomic mass of copper is 63.54 g/mol. Avagadro's number is 6.02 x 1023atoms/mol.


 * -a) 2.615E-05 m/s
 * +b) 2.876E-05 m/s
 * -c) 3.164E-05 m/s
 * -d) 3.480E-05 m/s
 * -e) 3.828E-05 m/s

4) A DC winch moter draws 24 amps at 159 volts as it lifts a 4.120E+03 N weight at a constant speed of 0.657 m/s. Assuming that all the electrical power is either converted into gravitational potential energy or ohmically heats the motor's coils, calculate the coil's resistance.


 * -a) 1.447E+00 &Omega;
 * -b) 1.591E+00 &Omega;
 * -c) 1.751E+00 &Omega;
 * +d) 1.926E+00 &Omega;
 * -e) 2.118E+00 &Omega;

Click these links for the keys:

Key: N1
1) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=42 C  and $$\tau=$$0.0166 s. What is the current at $$t=$$0.0156 s?


 * +a) 9.886E+02 A
 * -b) 1.087E+03 A
 * -c) 1.196E+03 A
 * -d) 1.316E+03 A
 * -e) 1.447E+03 A

2) Calculate the drift speed of electrons in a copper wire with a diameter of 4.9 mm carrying a 6.43 A current, given that there is one free electron per copper atom. The density of copper is 8.80 x 103kg/m3 and the atomic mass of copper is 63.54 g/mol. Avagadro's number is 6.02 x 1023atoms/mol.


 * -a) 2.109E-05 m/s
 * -b) 2.320E-05 m/s
 * +c) 2.552E-05 m/s
 * -d) 2.807E-05 m/s
 * -e) 3.088E-05 m/s

3) A DC winch moter draws 20 amps at 169 volts as it lifts a 5.120E+03 N weight at a constant speed of 0.543 m/s. Assuming that all the electrical power is either converted into gravitational potential energy or ohmically heats the motor's coils, calculate the coil's resistance.


 * +a) 1.500E+00 &Omega;
 * -b) 1.650E+00 &Omega;
 * -c) 1.815E+00 &Omega;
 * -d) 1.996E+00 &Omega;
 * -e) 2.196E+00 &Omega;

4) A make-believe metal has a density of 1.480E+04 kg/m3 and an atomic mass of 73.3 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * -a) 1.105E+29 e&minus;/m3
 * +b) 1.215E+29 e&minus;/m3
 * -c) 1.337E+29 e&minus;/m3
 * -d) 1.471E+29 e&minus;/m3
 * -e) 1.618E+29 e&minus;/m3

Click these links for the keys:

Key: N2
1) A DC winch moter draws 24 amps at 159 volts as it lifts a 4.120E+03 N weight at a constant speed of 0.657 m/s. Assuming that all the electrical power is either converted into gravitational potential energy or ohmically heats the motor's coils, calculate the coil's resistance.


 * -a) 1.447E+00 &Omega;
 * -b) 1.591E+00 &Omega;
 * -c) 1.751E+00 &Omega;
 * +d) 1.926E+00 &Omega;
 * -e) 2.118E+00 &Omega;

2) Calculate the drift speed of electrons in a copper wire with a diameter of 5.24 mm carrying a 1.8 A current, given that there is one free electron per copper atom. The density of copper is 8.80 x 103kg/m3 and the atomic mass of copper is 63.54 g/mol. Avagadro's number is 6.02 x 1023atoms/mol.


 * +a) 6.247E-06 m/s
 * -b) 6.872E-06 m/s
 * -c) 7.559E-06 m/s
 * -d) 8.315E-06 m/s
 * -e) 9.146E-06 m/s

3) A make-believe metal has a density of 8.060E+03 kg/m3 and an atomic mass of 19.7 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * -a) 1.850E+29 e&minus;/m3
 * -b) 2.036E+29 e&minus;/m3
 * -c) 2.239E+29 e&minus;/m3
 * +d) 2.463E+29 e&minus;/m3
 * -e) 2.709E+29 e&minus;/m3

4) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=87 C  and $$\tau=$$0.0154 s. What is the current at $$t=$$0.0211 s?


 * +a) 1.435E+03 A
 * -b) 1.579E+03 A
 * -c) 1.737E+03 A
 * -d) 1.910E+03 A
 * -e) 2.102E+03 A

Click these links for the keys:

Key: O0
1) A device requires consumes 126 W of power and requires 1.11 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * +a) 2.110E+05 A/m2
 * -b) 2.321E+05 A/m2
 * -c) 2.553E+05 A/m2
 * -d) 2.809E+05 A/m2
 * -e) 3.090E+05 A/m2

2) Imagine a substance could be made into a very hot filament. Suppose the resitance is 4.48 &Omega; at a temperature of 56&deg;C and that the temperature coefficient of expansion is 4.550E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 449 &deg;C?


 * -a) 1.028E+01 &Omega;
 * -b) 1.079E+01 &Omega;
 * -c) 1.133E+01 &Omega;
 * -d) 1.190E+01 &Omega;
 * +e) 1.249E+01 &Omega;

3) Calculate the resistance of a 12-gauge copper wire that is 45 m long and carries a current of 51 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * -a) 1.716E-01 &Omega;
 * -b) 1.888E-01 &Omega;
 * -c) 2.076E-01 &Omega;
 * +d) 2.284E-01 &Omega;
 * -e) 2.512E-01 &Omega;

4) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=78 C  and $$\tau=$$0.0244 s. What is the current at $$t=$$0.0225 s?


 * +a) 1.271E+03 A
 * -b) 1.398E+03 A
 * -c) 1.538E+03 A
 * -d) 1.692E+03 A
 * -e) 1.861E+03 A

Click these links for the keys:

Key: O1
1) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=97 C  and $$\tau=$$0.0132 s. What is the current at $$t=$$0.0225 s?


 * +a) 1.336E+03 A
 * -b) 1.470E+03 A
 * -c) 1.617E+03 A
 * -d) 1.779E+03 A
 * -e) 1.957E+03 A

2) A device requires consumes 81 W of power and requires 2.34 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * -a) 3.342E+05 A/m2
 * -b) 3.677E+05 A/m2
 * -c) 4.044E+05 A/m2
 * +d) 4.449E+05 A/m2
 * -e) 4.894E+05 A/m2

3) Imagine a substance could be made into a very hot filament. Suppose the resitance is 1.56 &Omega; at a temperature of 97&deg;C and that the temperature coefficient of expansion is 5.020E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 340 &deg;C?


 * +a) 3.463E+00 &Omega;
 * -b) 3.636E+00 &Omega;
 * -c) 3.818E+00 &Omega;
 * -d) 4.009E+00 &Omega;
 * -e) 4.209E+00 &Omega;

4) Calculate the resistance of a 12-gauge copper wire that is 59 m long and carries a current of 26 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * +a) 2.995E-01 &Omega;
 * -b) 3.294E-01 &Omega;
 * -c) 3.623E-01 &Omega;
 * -d) 3.986E-01 &Omega;
 * -e) 4.384E-01 &Omega;

Click these links for the keys:

Key: O2
1) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=87 C  and $$\tau=$$0.0154 s. What is the current at $$t=$$0.0211 s?


 * +a) 1.435E+03 A
 * -b) 1.579E+03 A
 * -c) 1.737E+03 A
 * -d) 1.910E+03 A
 * -e) 2.102E+03 A

2) Imagine a substance could be made into a very hot filament. Suppose the resitance is 6.74 &Omega; at a temperature of 89&deg;C and that the temperature coefficient of expansion is 4.990E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 366 &deg;C?


 * -a) 1.529E+01 &Omega;
 * +b) 1.606E+01 &Omega;
 * -c) 1.686E+01 &Omega;
 * -d) 1.770E+01 &Omega;
 * -e) 1.859E+01 &Omega;

3) A device requires consumes 88 W of power and requires 11.3 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * -a) 1.467E+06 A/m2
 * -b) 1.614E+06 A/m2
 * -c) 1.775E+06 A/m2
 * -d) 1.953E+06 A/m2
 * +e) 2.148E+06 A/m2

4) Calculate the resistance of a 12-gauge copper wire that is 19 m long and carries a current of 59 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * -a) 7.970E-02 &Omega;
 * -b) 8.767E-02 &Omega;
 * +c) 9.644E-02 &Omega;
 * -d) 1.061E-01 &Omega;
 * -e) 1.167E-01 &Omega;

Click these links for the keys:

Key: P0
1) What is consumer cost to operate one 105&minus;W incandescent bulb for 11 hours per day for 1 year (365 days) if the cost of electricity is $0.131 per kilowatt-hour?


 * -a) $5.021E+01
 * +b) $5.523E+01
 * -c) $6.075E+01
 * -d) $6.682E+01
 * -e) $7.351E+01

2) Calculate the electric field in a 12-gauge copper wire that is 84 m long and carries a current of 48 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * -a) 1.664E-04 V/m
 * -b) 1.830E-04 V/m
 * -c) 2.013E-04 V/m
 * -d) 2.215E-04 V/m
 * +e) 2.436E-04 V/m

3) A device requires consumes 120 W of power and requires 4.85 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * -a) 7.620E+05 A/m2
 * -b) 8.382E+05 A/m2
 * +c) 9.221E+05 A/m2
 * -d) 1.014E+06 A/m2
 * -e) 1.116E+06 A/m2

4) Calculate the resistance of a 12-gauge copper wire that is 15 m long and carries a current of 27 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * -a) 5.200E-02 &Omega;
 * -b) 5.720E-02 &Omega;
 * -c) 6.292E-02 &Omega;
 * -d) 6.921E-02 &Omega;
 * +e) 7.613E-02 &Omega;

Click these links for the keys:

Key: P1
1) Calculate the electric field in a 12-gauge copper wire that is 41 m long and carries a current of 71 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * +a) 3.604E-04 V/m
 * -b) 3.964E-04 V/m
 * -c) 4.360E-04 V/m
 * -d) 4.796E-04 V/m
 * -e) 5.276E-04 V/m

2) Calculate the resistance of a 12-gauge copper wire that is 69 m long and carries a current of 98 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * -a) 2.631E-01 &Omega;
 * -b) 2.894E-01 &Omega;
 * -c) 3.184E-01 &Omega;
 * +d) 3.502E-01 &Omega;
 * -e) 3.852E-01 &Omega;

3) What is consumer cost to operate one 73&minus;W incandescent bulb for 11 hours per day for 1 year (365 days) if the cost of electricity is $0.113 per kilowatt-hour?


 * +a) $3.312E+01
 * -b) $3.643E+01
 * -c) $4.007E+01
 * -d) $4.408E+01
 * -e) $4.849E+01

4) A device requires consumes 166 W of power and requires 9.99 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * -a) 1.570E+06 A/m2
 * -b) 1.727E+06 A/m2
 * +c) 1.899E+06 A/m2
 * -d) 2.089E+06 A/m2
 * -e) 2.298E+06 A/m2

Click these links for the keys:

Key: P2
1) A device requires consumes 120 W of power and requires 4.85 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * -a) 7.620E+05 A/m2
 * -b) 8.382E+05 A/m2
 * +c) 9.221E+05 A/m2
 * -d) 1.014E+06 A/m2
 * -e) 1.116E+06 A/m2

2) What is consumer cost to operate one 65&minus;W incandescent bulb for 12 hours per day for 1 year (365 days) if the cost of electricity is $0.134 per kilowatt-hour?


 * -a) $2.866E+01
 * -b) $3.153E+01
 * -c) $3.468E+01
 * +d) $3.815E+01
 * -e) $4.196E+01

3) Calculate the electric field in a 12-gauge copper wire that is 78 m long and carries a current of 24 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * +a) 1.218E-04 V/m
 * -b) 1.340E-04 V/m
 * -c) 1.474E-04 V/m
 * -d) 1.621E-04 V/m
 * -e) 1.783E-04 V/m

4) Calculate the resistance of a 12-gauge copper wire that is 90 m long and carries a current of 34 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * -a) 3.432E-01 &Omega;
 * -b) 3.775E-01 &Omega;
 * -c) 4.153E-01 &Omega;
 * +d) 4.568E-01 &Omega;
 * -e) 5.025E-01 &Omega;

Click these links for the keys:

Key: Q0
1) What is the average current involved when a truck battery sets in motion 779 C of charge in 3.96 s while starting an engine?


 * -a) 1.626E+02 A
 * -b) 1.788E+02 A
 * +c) 1.967E+02 A
 * -d) 2.164E+02 A
 * -e) 2.380E+02 A

2) What is consumer cost to operate one 69&minus;W incandescent bulb for 7 hours per day for 1 year (365 days) if the cost of electricity is $0.117 per kilowatt-hour?


 * +a) $2.063E+01
 * -b) $2.269E+01
 * -c) $2.496E+01
 * -d) $2.745E+01
 * -e) $3.020E+01

3) Calculate the resistance of a 12-gauge copper wire that is 78 m long and carries a current of 82 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * -a) 2.974E-01 &Omega;
 * -b) 3.272E-01 &Omega;
 * -c) 3.599E-01 &Omega;
 * +d) 3.959E-01 &Omega;
 * -e) 4.355E-01 &Omega;

4) Calculate the electric field in a 12-gauge copper wire that is 18 m long and carries a current of 22 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * +a) 1.117E-04 V/m
 * -b) 1.228E-04 V/m
 * -c) 1.351E-04 V/m
 * -d) 1.486E-04 V/m
 * -e) 1.635E-04 V/m

Click these links for the keys:

Key: Q1
1) What is the average current involved when a truck battery sets in motion 659 C of charge in 5.48 s while starting an engine?


 * -a) 8.214E+01 A
 * -b) 9.035E+01 A
 * -c) 9.938E+01 A
 * -d) 1.093E+02 A
 * +e) 1.203E+02 A

2) What is consumer cost to operate one 74&minus;W incandescent bulb for 9 hours per day for 1 year (365 days) if the cost of electricity is $0.119 per kilowatt-hour?


 * -a) $1.976E+01
 * -b) $2.173E+01
 * -c) $2.391E+01
 * -d) $2.630E+01
 * +e) $2.893E+01

3) Calculate the resistance of a 12-gauge copper wire that is 69 m long and carries a current of 98 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * -a) 2.631E-01 &Omega;
 * -b) 2.894E-01 &Omega;
 * -c) 3.184E-01 &Omega;
 * +d) 3.502E-01 &Omega;
 * -e) 3.852E-01 &Omega;

4) Calculate the electric field in a 12-gauge copper wire that is 44 m long and carries a current of 78 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * -a) 2.704E-04 V/m
 * -b) 2.974E-04 V/m
 * -c) 3.272E-04 V/m
 * -d) 3.599E-04 V/m
 * +e) 3.959E-04 V/m

Click these links for the keys:

Key: Q2
1) What is consumer cost to operate one 69&minus;W incandescent bulb for 7 hours per day for 1 year (365 days) if the cost of electricity is $0.117 per kilowatt-hour?


 * +a) $2.063E+01
 * -b) $2.269E+01
 * -c) $2.496E+01
 * -d) $2.745E+01
 * -e) $3.020E+01

2) What is the average current involved when a truck battery sets in motion 631 C of charge in 3.8 s while starting an engine?


 * +a) 1.661E+02 A
 * -b) 1.827E+02 A
 * -c) 2.009E+02 A
 * -d) 2.210E+02 A
 * -e) 2.431E+02 A

3) Calculate the electric field in a 12-gauge copper wire that is 56 m long and carries a current of 81 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * +a) 4.111E-04 V/m
 * -b) 4.522E-04 V/m
 * -c) 4.975E-04 V/m
 * -d) 5.472E-04 V/m
 * -e) 6.019E-04 V/m

4) Calculate the resistance of a 12-gauge copper wire that is 81 m long and carries a current of 32 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * -a) 3.737E-01 &Omega;
 * +b) 4.111E-01 &Omega;
 * -c) 4.522E-01 &Omega;
 * -d) 4.975E-01 &Omega;
 * -e) 5.472E-01 &Omega;

Click these links for the keys:

Key: R0
1) Calculate the resistance of a 12-gauge copper wire that is 59 m long and carries a current of 26 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * +a) 2.995E-01 &Omega;
 * -b) 3.294E-01 &Omega;
 * -c) 3.623E-01 &Omega;
 * -d) 3.986E-01 &Omega;
 * -e) 4.384E-01 &Omega;

2) Calculate the electric field in a 12-gauge copper wire that is 62 m long and carries a current of 52 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * -a) 1.983E-04 V/m
 * -b) 2.181E-04 V/m
 * -c) 2.399E-04 V/m
 * +d) 2.639E-04 V/m
 * -e) 2.903E-04 V/m

3) Imagine a substance could be made into a very hot filament. Suppose the resitance is 1.56 &Omega; at a temperature of 97&deg;C and that the temperature coefficient of expansion is 5.020E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 340 &deg;C?


 * +a) 3.463E+00 &Omega;
 * -b) 3.636E+00 &Omega;
 * -c) 3.818E+00 &Omega;
 * -d) 4.009E+00 &Omega;
 * -e) 4.209E+00 &Omega;

4) A device requires consumes 176 W of power and requires 11.9 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * +a) 2.262E+06 A/m2
 * -b) 2.489E+06 A/m2
 * -c) 2.737E+06 A/m2
 * -d) 3.011E+06 A/m2
 * -e) 3.312E+06 A/m2

Click these links for the keys:

Key: R1
1) A device requires consumes 73 W of power and requires 9.14 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * -a) 1.187E+06 A/m2
 * -b) 1.306E+06 A/m2
 * -c) 1.436E+06 A/m2
 * -d) 1.580E+06 A/m2
 * +e) 1.738E+06 A/m2

2) Calculate the electric field in a 12-gauge copper wire that is 21 m long and carries a current of 42 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * -a) 1.602E-04 V/m
 * -b) 1.762E-04 V/m
 * -c) 1.938E-04 V/m
 * +d) 2.132E-04 V/m
 * -e) 2.345E-04 V/m

3) Calculate the resistance of a 12-gauge copper wire that is 45 m long and carries a current of 51 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * -a) 1.716E-01 &Omega;
 * -b) 1.888E-01 &Omega;
 * -c) 2.076E-01 &Omega;
 * +d) 2.284E-01 &Omega;
 * -e) 2.512E-01 &Omega;

4) Imagine a substance could be made into a very hot filament. Suppose the resitance is 5.94 &Omega; at a temperature of 70&deg;C and that the temperature coefficient of expansion is 5.120E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 386 &deg;C?


 * -a) 1.279E+01 &Omega;
 * -b) 1.343E+01 &Omega;
 * -c) 1.410E+01 &Omega;
 * -d) 1.481E+01 &Omega;
 * +e) 1.555E+01 &Omega;

Click these links for the keys:

Key: R2
1) Calculate the resistance of a 12-gauge copper wire that is 48 m long and carries a current of 50 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * -a) 2.215E-01 &Omega;
 * +b) 2.436E-01 &Omega;
 * -c) 2.680E-01 &Omega;
 * -d) 2.948E-01 &Omega;
 * -e) 3.243E-01 &Omega;

2) Calculate the electric field in a 12-gauge copper wire that is 84 m long and carries a current of 48 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * -a) 1.664E-04 V/m
 * -b) 1.830E-04 V/m
 * -c) 2.013E-04 V/m
 * -d) 2.215E-04 V/m
 * +e) 2.436E-04 V/m

3) A device requires consumes 73 W of power and requires 9.14 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * -a) 1.187E+06 A/m2
 * -b) 1.306E+06 A/m2
 * -c) 1.436E+06 A/m2
 * -d) 1.580E+06 A/m2
 * +e) 1.738E+06 A/m2

4) Imagine a substance could be made into a very hot filament. Suppose the resitance is 1.98 &Omega; at a temperature of 92&deg;C and that the temperature coefficient of expansion is 5.080E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 455 &deg;C?


 * -a) 5.363E+00 &Omega;
 * +b) 5.631E+00 &Omega;
 * -c) 5.913E+00 &Omega;
 * -d) 6.208E+00 &Omega;
 * -e) 6.519E+00 &Omega;

Click these links for the keys:

Key: S0
1) A make-believe metal has a density of 3.230E+03 kg/m3 and an atomic mass of 116.0 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * -a) 1.385E+28 e&minus;/m3
 * -b) 1.524E+28 e&minus;/m3
 * +c) 1.676E+28 e&minus;/m3
 * -d) 1.844E+28 e&minus;/m3
 * -e) 2.028E+28 e&minus;/m3

2) Calculate the drift speed of electrons in a copper wire with a diameter of 4.49 mm carrying a 11.6 A current, given that there is one free electron per copper atom. The density of copper is 8.80 x 103kg/m3 and the atomic mass of copper is 63.54 g/mol. Avagadro's number is 6.02 x 1023atoms/mol.


 * -a) 4.120E-05 m/s
 * -b) 4.532E-05 m/s
 * -c) 4.985E-05 m/s
 * +d) 5.483E-05 m/s
 * -e) 6.032E-05 m/s

3) Calculate the electric field in a 12-gauge copper wire that is 15 m long and carries a current of 85 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * -a) 2.947E-04 V/m
 * -b) 3.241E-04 V/m
 * -c) 3.565E-04 V/m
 * -d) 3.922E-04 V/m
 * +e) 4.314E-04 V/m

4) A device requires consumes 78 W of power and requires 11.3 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * -a) 1.953E+06 A/m2
 * +b) 2.148E+06 A/m2
 * -c) 2.363E+06 A/m2
 * -d) 2.599E+06 A/m2
 * -e) 2.859E+06 A/m2

Click these links for the keys:

Key: S1
1) Calculate the electric field in a 12-gauge copper wire that is 21 m long and carries a current of 42 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * -a) 1.602E-04 V/m
 * -b) 1.762E-04 V/m
 * -c) 1.938E-04 V/m
 * +d) 2.132E-04 V/m
 * -e) 2.345E-04 V/m

2) A make-believe metal has a density of 1.300E+04 kg/m3 and an atomic mass of 75.7 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * -a) 9.398E+28 e&minus;/m3
 * +b) 1.034E+29 e&minus;/m3
 * -c) 1.137E+29 e&minus;/m3
 * -d) 1.251E+29 e&minus;/m3
 * -e) 1.376E+29 e&minus;/m3

3) A device requires consumes 172 W of power and requires 2.21 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * -a) 3.157E+05 A/m2
 * -b) 3.472E+05 A/m2
 * -c) 3.820E+05 A/m2
 * +d) 4.202E+05 A/m2
 * -e) 4.622E+05 A/m2

4) Calculate the drift speed of electrons in a copper wire with a diameter of 3.3 mm carrying a 18.5 A current, given that there is one free electron per copper atom. The density of copper is 8.80 x 103kg/m3 and the atomic mass of copper is 63.54 g/mol. Avagadro's number is 6.02 x 1023atoms/mol.


 * -a) 1.472E-04 m/s
 * +b) 1.619E-04 m/s
 * -c) 1.781E-04 m/s
 * -d) 1.959E-04 m/s
 * -e) 2.155E-04 m/s

Click these links for the keys:

Key: S2
1) A device requires consumes 84 W of power and requires 3.66 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * -a) 5.751E+05 A/m2
 * -b) 6.326E+05 A/m2
 * +c) 6.958E+05 A/m2
 * -d) 7.654E+05 A/m2
 * -e) 8.419E+05 A/m2

2) Calculate the electric field in a 12-gauge copper wire that is 16 m long and carries a current of 58 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * -a) 2.212E-04 V/m
 * -b) 2.433E-04 V/m
 * -c) 2.676E-04 V/m
 * +d) 2.944E-04 V/m
 * -e) 3.238E-04 V/m

3) Calculate the drift speed of electrons in a copper wire with a diameter of 5.47 mm carrying a 3.48 A current, given that there is one free electron per copper atom. The density of copper is 8.80 x 103kg/m3 and the atomic mass of copper is 63.54 g/mol. Avagadro's number is 6.02 x 1023atoms/mol.


 * -a) 1.008E-05 m/s
 * +b) 1.108E-05 m/s
 * -c) 1.219E-05 m/s
 * -d) 1.341E-05 m/s
 * -e) 1.475E-05 m/s

4) A make-believe metal has a density of 6.650E+03 kg/m3 and an atomic mass of 67.5 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * -a) 4.456E+28 e&minus;/m3
 * -b) 4.901E+28 e&minus;/m3
 * -c) 5.392E+28 e&minus;/m3
 * +d) 5.931E+28 e&minus;/m3
 * -e) 6.524E+28 e&minus;/m3

Click these links for the keys:

Key: T0
1) What is the average current involved when a truck battery sets in motion 572 C of charge in 3.33 s while starting an engine?


 * -a) 1.173E+02 A
 * -b) 1.291E+02 A
 * -c) 1.420E+02 A
 * -d) 1.562E+02 A
 * +e) 1.718E+02 A

2) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=18 C  and $$\tau=$$0.0169 s. What is the current at $$t=$$0.0137 s?


 * -a) 3.913E+02 A
 * -b) 4.305E+02 A
 * +c) 4.735E+02 A
 * -d) 5.209E+02 A
 * -e) 5.729E+02 A

3) A make-believe metal has a density of 1.580E+04 kg/m3 and an atomic mass of 41.5 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * +a) 2.292E+29 e&minus;/m3
 * -b) 2.521E+29 e&minus;/m3
 * -c) 2.773E+29 e&minus;/m3
 * -d) 3.051E+29 e&minus;/m3
 * -e) 3.356E+29 e&minus;/m3

4) Calculate the electric field in a 12-gauge copper wire that is 62 m long and carries a current of 52 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * -a) 1.983E-04 V/m
 * -b) 2.181E-04 V/m
 * -c) 2.399E-04 V/m
 * +d) 2.639E-04 V/m
 * -e) 2.903E-04 V/m

Click these links for the keys:

Key: T1
1) What is the average current involved when a truck battery sets in motion 572 C of charge in 3.33 s while starting an engine?


 * -a) 1.173E+02 A
 * -b) 1.291E+02 A
 * -c) 1.420E+02 A
 * -d) 1.562E+02 A
 * +e) 1.718E+02 A

2) A make-believe metal has a density of 1.180E+04 kg/m3 and an atomic mass of 121.0 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * -a) 4.010E+28 e&minus;/m3
 * -b) 4.411E+28 e&minus;/m3
 * -c) 4.852E+28 e&minus;/m3
 * -d) 5.337E+28 e&minus;/m3
 * +e) 5.871E+28 e&minus;/m3

3) Calculate the electric field in a 12-gauge copper wire that is 64 m long and carries a current of 76 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * -a) 2.635E-04 V/m
 * -b) 2.898E-04 V/m
 * -c) 3.188E-04 V/m
 * -d) 3.507E-04 V/m
 * +e) 3.857E-04 V/m

4) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=11 C  and $$\tau=$$0.0162 s. What is the current at $$t=$$0.0249 s?


 * -a) 9.972E+01 A
 * -b) 1.097E+02 A
 * -c) 1.207E+02 A
 * -d) 1.327E+02 A
 * +e) 1.460E+02 A

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Key: T2
1) A make-believe metal has a density of 3.470E+03 kg/m3 and an atomic mass of 33.8 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * +a) 6.180E+28 e&minus;/m3
 * -b) 6.798E+28 e&minus;/m3
 * -c) 7.478E+28 e&minus;/m3
 * -d) 8.226E+28 e&minus;/m3
 * -e) 9.049E+28 e&minus;/m3

2) What is the average current involved when a truck battery sets in motion 659 C of charge in 5.48 s while starting an engine?


 * -a) 8.214E+01 A
 * -b) 9.035E+01 A
 * -c) 9.938E+01 A
 * -d) 1.093E+02 A
 * +e) 1.203E+02 A

3) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=58 C  and $$\tau=$$0.0249 s. What is the current at $$t=$$0.0191 s?


 * -a) 8.127E+02 A
 * -b) 8.939E+02 A
 * -c) 9.833E+02 A
 * +d) 1.082E+03 A
 * -e) 1.190E+03 A

4) Calculate the electric field in a 12-gauge copper wire that is 23 m long and carries a current of 64 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * -a) 2.953E-04 V/m
 * +b) 3.248E-04 V/m
 * -c) 3.573E-04 V/m
 * -d) 3.930E-04 V/m
 * -e) 4.324E-04 V/m

Click these links for the keys:

Key: U0
1) Calculate the electric field in a 12-gauge copper wire that is 78 m long and carries a current of 24 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * +a) 1.218E-04 V/m
 * -b) 1.340E-04 V/m
 * -c) 1.474E-04 V/m
 * -d) 1.621E-04 V/m
 * -e) 1.783E-04 V/m

2) What is the average current involved when a truck battery sets in motion 738 C of charge in 3.87 s while starting an engine?


 * +a) 1.907E+02 A
 * -b) 2.098E+02 A
 * -c) 2.307E+02 A
 * -d) 2.538E+02 A
 * -e) 2.792E+02 A

3) Imagine a substance could be made into a very hot filament. Suppose the resitance is 3.58 &Omega; at a temperature of 24&deg;C and that the temperature coefficient of expansion is 5.520E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 349 &deg;C?


 * -a) 9.526E+00 &Omega;
 * +b) 1.000E+01 &Omega;
 * -c) 1.050E+01 &Omega;
 * -d) 1.103E+01 &Omega;
 * -e) 1.158E+01 &Omega;

4) A device requires consumes 176 W of power and requires 11.9 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * +a) 2.262E+06 A/m2
 * -b) 2.489E+06 A/m2
 * -c) 2.737E+06 A/m2
 * -d) 3.011E+06 A/m2
 * -e) 3.312E+06 A/m2

Click these links for the keys:

Key: U1
1) What is the average current involved when a truck battery sets in motion 779 C of charge in 3.96 s while starting an engine?


 * -a) 1.626E+02 A
 * -b) 1.788E+02 A
 * +c) 1.967E+02 A
 * -d) 2.164E+02 A
 * -e) 2.380E+02 A

2) Calculate the electric field in a 12-gauge copper wire that is 21 m long and carries a current of 42 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * -a) 1.602E-04 V/m
 * -b) 1.762E-04 V/m
 * -c) 1.938E-04 V/m
 * +d) 2.132E-04 V/m
 * -e) 2.345E-04 V/m

3) A device requires consumes 78 W of power and requires 11.3 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * -a) 1.953E+06 A/m2
 * +b) 2.148E+06 A/m2
 * -c) 2.363E+06 A/m2
 * -d) 2.599E+06 A/m2
 * -e) 2.859E+06 A/m2

4) Imagine a substance could be made into a very hot filament. Suppose the resitance is 3.58 &Omega; at a temperature of 24&deg;C and that the temperature coefficient of expansion is 5.520E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 349 &deg;C?


 * -a) 9.526E+00 &Omega;
 * +b) 1.000E+01 &Omega;
 * -c) 1.050E+01 &Omega;
 * -d) 1.103E+01 &Omega;
 * -e) 1.158E+01 &Omega;

Click these links for the keys:

Key: U2
1) What is the average current involved when a truck battery sets in motion 631 C of charge in 3.8 s while starting an engine?


 * +a) 1.661E+02 A
 * -b) 1.827E+02 A
 * -c) 2.009E+02 A
 * -d) 2.210E+02 A
 * -e) 2.431E+02 A

2) A device requires consumes 142 W of power and requires 12.1 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * +a) 2.300E+06 A/m2
 * -b) 2.530E+06 A/m2
 * -c) 2.783E+06 A/m2
 * -d) 3.062E+06 A/m2
 * -e) 3.368E+06 A/m2

3) Imagine a substance could be made into a very hot filament. Suppose the resitance is 5.94 &Omega; at a temperature of 70&deg;C and that the temperature coefficient of expansion is 5.120E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 386 &deg;C?


 * -a) 1.279E+01 &Omega;
 * -b) 1.343E+01 &Omega;
 * -c) 1.410E+01 &Omega;
 * -d) 1.481E+01 &Omega;
 * +e) 1.555E+01 &Omega;

4) Calculate the electric field in a 12-gauge copper wire that is 17 m long and carries a current of 56 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * -a) 1.941E-04 V/m
 * -b) 2.135E-04 V/m
 * -c) 2.349E-04 V/m
 * -d) 2.584E-04 V/m
 * +e) 2.842E-04 V/m

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Key: V0
1) What is consumer cost to operate one 56&minus;W incandescent bulb for 6 hours per day for 1 year (365 days) if the cost of electricity is $0.13 per kilowatt-hour?


 * -a) $1.198E+01
 * -b) $1.318E+01
 * -c) $1.449E+01
 * +d) $1.594E+01
 * -e) $1.754E+01

2) A device requires consumes 196 W of power and requires 2.4 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * +a) 4.563E+05 A/m2
 * -b) 5.019E+05 A/m2
 * -c) 5.521E+05 A/m2
 * -d) 6.073E+05 A/m2
 * -e) 6.680E+05 A/m2

3) What is the average current involved when a truck battery sets in motion 559 C of charge in 4.13 s while starting an engine?


 * -a) 9.245E+01 A
 * -b) 1.017E+02 A
 * -c) 1.119E+02 A
 * -d) 1.230E+02 A
 * +e) 1.354E+02 A

4) Calculate the resistance of a 12-gauge copper wire that is 19 m long and carries a current of 59 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * -a) 7.970E-02 &Omega;
 * -b) 8.767E-02 &Omega;
 * +c) 9.644E-02 &Omega;
 * -d) 1.061E-01 &Omega;
 * -e) 1.167E-01 &Omega;

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Key: V1
1) Calculate the resistance of a 12-gauge copper wire that is 86 m long and carries a current of 97 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * +a) 4.365E-01 &Omega;
 * -b) 4.801E-01 &Omega;
 * -c) 5.282E-01 &Omega;
 * -d) 5.810E-01 &Omega;
 * -e) 6.391E-01 &Omega;

2) What is consumer cost to operate one 102&minus;W incandescent bulb for 6 hours per day for 1 year (365 days) if the cost of electricity is $0.127 per kilowatt-hour?


 * -a) $2.131E+01
 * -b) $2.345E+01
 * -c) $2.579E+01
 * +d) $2.837E+01
 * -e) $3.121E+01

3) What is the average current involved when a truck battery sets in motion 659 C of charge in 5.48 s while starting an engine?


 * -a) 8.214E+01 A
 * -b) 9.035E+01 A
 * -c) 9.938E+01 A
 * -d) 1.093E+02 A
 * +e) 1.203E+02 A

4) A device requires consumes 103 W of power and requires 6.3 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * -a) 8.999E+05 A/m2
 * -b) 9.899E+05 A/m2
 * -c) 1.089E+06 A/m2
 * +d) 1.198E+06 A/m2
 * -e) 1.317E+06 A/m2

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Key: V2
1) What is the average current involved when a truck battery sets in motion 682 C of charge in 5.29 s while starting an engine?


 * -a) 1.065E+02 A
 * -b) 1.172E+02 A
 * +c) 1.289E+02 A
 * -d) 1.418E+02 A
 * -e) 1.560E+02 A

2) Calculate the resistance of a 12-gauge copper wire that is 48 m long and carries a current of 50 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * -a) 2.215E-01 &Omega;
 * +b) 2.436E-01 &Omega;
 * -c) 2.680E-01 &Omega;
 * -d) 2.948E-01 &Omega;
 * -e) 3.243E-01 &Omega;

3) What is consumer cost to operate one 76&minus;W incandescent bulb for 9 hours per day for 1 year (365 days) if the cost of electricity is $0.144 per kilowatt-hour?


 * +a) $3.595E+01
 * -b) $3.955E+01
 * -c) $4.350E+01
 * -d) $4.785E+01
 * -e) $5.264E+01

4) A device requires consumes 196 W of power and requires 2.4 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * +a) 4.563E+05 A/m2
 * -b) 5.019E+05 A/m2
 * -c) 5.521E+05 A/m2
 * -d) 6.073E+05 A/m2
 * -e) 6.680E+05 A/m2

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Key: W0
1) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=97 C  and $$\tau=$$0.0132 s. What is the current at $$t=$$0.0225 s?


 * +a) 1.336E+03 A
 * -b) 1.470E+03 A
 * -c) 1.617E+03 A
 * -d) 1.779E+03 A
 * -e) 1.957E+03 A

2) Imagine a substance could be made into a very hot filament. Suppose the resitance is 5.89 &Omega; at a temperature of 43&deg;C and that the temperature coefficient of expansion is 4.400E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 398 &deg;C?


 * -a) 1.369E+01 &Omega;
 * -b) 1.437E+01 &Omega;
 * +c) 1.509E+01 &Omega;
 * -d) 1.584E+01 &Omega;
 * -e) 1.664E+01 &Omega;

3) Calculate the electric field in a 12-gauge copper wire that is 18 m long and carries a current of 22 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * +a) 1.117E-04 V/m
 * -b) 1.228E-04 V/m
 * -c) 1.351E-04 V/m
 * -d) 1.486E-04 V/m
 * -e) 1.635E-04 V/m

4) Calculate the drift speed of electrons in a copper wire with a diameter of 3.53 mm carrying a 2.8 A current, given that there is one free electron per copper atom. The density of copper is 8.80 x 103kg/m3 and the atomic mass of copper is 63.54 g/mol. Avagadro's number is 6.02 x 1023atoms/mol.


 * -a) 1.947E-05 m/s
 * +b) 2.141E-05 m/s
 * -c) 2.355E-05 m/s
 * -d) 2.591E-05 m/s
 * -e) 2.850E-05 m/s

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Key: W1
1) Imagine a substance could be made into a very hot filament. Suppose the resitance is 6.74 &Omega; at a temperature of 89&deg;C and that the temperature coefficient of expansion is 4.990E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 366 &deg;C?


 * -a) 1.529E+01 &Omega;
 * +b) 1.606E+01 &Omega;
 * -c) 1.686E+01 &Omega;
 * -d) 1.770E+01 &Omega;
 * -e) 1.859E+01 &Omega;

2) Calculate the drift speed of electrons in a copper wire with a diameter of 5.71 mm carrying a 7.54 A current, given that there is one free electron per copper atom. The density of copper is 8.80 x 103kg/m3 and the atomic mass of copper is 63.54 g/mol. Avagadro's number is 6.02 x 1023atoms/mol.


 * +a) 2.204E-05 m/s
 * -b) 2.424E-05 m/s
 * -c) 2.667E-05 m/s
 * -d) 2.933E-05 m/s
 * -e) 3.227E-05 m/s

3) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=85 C  and $$\tau=$$0.021 s. What is the current at $$t=$$0.0128 s?


 * -a) 1.503E+03 A
 * -b) 1.653E+03 A
 * -c) 1.818E+03 A
 * -d) 2.000E+03 A
 * +e) 2.200E+03 A

4) Calculate the electric field in a 12-gauge copper wire that is 62 m long and carries a current of 52 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * -a) 1.983E-04 V/m
 * -b) 2.181E-04 V/m
 * -c) 2.399E-04 V/m
 * +d) 2.639E-04 V/m
 * -e) 2.903E-04 V/m

Click these links for the keys:

Key: W2
1) Imagine a substance could be made into a very hot filament. Suppose the resitance is 5.73 &Omega; at a temperature of 99&deg;C and that the temperature coefficient of expansion is 5.260E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 420 &deg;C?


 * -a) 1.267E+01 &Omega;
 * -b) 1.331E+01 &Omega;
 * -c) 1.397E+01 &Omega;
 * -d) 1.467E+01 &Omega;
 * +e) 1.540E+01 &Omega;

2) The charge passing a plane intersecting a wire is $$Q_M=\left(1-e^{t/\tau}\right)$$, where $$Q_M$$=85 C  and $$\tau=$$0.021 s. What is the current at $$t=$$0.0128 s?


 * -a) 1.503E+03 A
 * -b) 1.653E+03 A
 * -c) 1.818E+03 A
 * -d) 2.000E+03 A
 * +e) 2.200E+03 A

3) Calculate the drift speed of electrons in a copper wire with a diameter of 2.72 mm carrying a 16.2 A current, given that there is one free electron per copper atom. The density of copper is 8.80 x 103kg/m3 and the atomic mass of copper is 63.54 g/mol. Avagadro's number is 6.02 x 1023atoms/mol.


 * +a) 2.087E-04 m/s
 * -b) 2.295E-04 m/s
 * -c) 2.525E-04 m/s
 * -d) 2.777E-04 m/s
 * -e) 3.055E-04 m/s

4) Calculate the electric field in a 12-gauge copper wire that is 44 m long and carries a current of 78 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * -a) 2.704E-04 V/m
 * -b) 2.974E-04 V/m
 * -c) 3.272E-04 V/m
 * -d) 3.599E-04 V/m
 * +e) 3.959E-04 V/m

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Key: X0
1) What is the average current involved when a truck battery sets in motion 682 C of charge in 5.29 s while starting an engine?


 * -a) 1.065E+02 A
 * -b) 1.172E+02 A
 * +c) 1.289E+02 A
 * -d) 1.418E+02 A
 * -e) 1.560E+02 A

2) Calculate the drift speed of electrons in a copper wire with a diameter of 5.82 mm carrying a 9.11 A current, given that there is one free electron per copper atom. The density of copper is 8.80 x 103kg/m3 and the atomic mass of copper is 63.54 g/mol. Avagadro's number is 6.02 x 1023atoms/mol.


 * -a) 1.926E-05 m/s
 * -b) 2.118E-05 m/s
 * -c) 2.330E-05 m/s
 * +d) 2.563E-05 m/s
 * -e) 2.819E-05 m/s

3) A DC winch moter draws 20 amps at 157 volts as it lifts a 5.270E+03 N weight at a constant speed of 0.403 m/s. Assuming that all the electrical power is either converted into gravitational potential energy or ohmically heats the motor's coils, calculate the coil's resistance.


 * +a) 2.540E+00 &Omega;
 * -b) 2.795E+00 &Omega;
 * -c) 3.074E+00 &Omega;
 * -d) 3.381E+00 &Omega;
 * -e) 3.720E+00 &Omega;

4) Calculate the electric field in a 12-gauge copper wire that is 18 m long and carries a current of 22 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * +a) 1.117E-04 V/m
 * -b) 1.228E-04 V/m
 * -c) 1.351E-04 V/m
 * -d) 1.486E-04 V/m
 * -e) 1.635E-04 V/m

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Key: X1
1) Calculate the electric field in a 12-gauge copper wire that is 15 m long and carries a current of 85 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * -a) 2.947E-04 V/m
 * -b) 3.241E-04 V/m
 * -c) 3.565E-04 V/m
 * -d) 3.922E-04 V/m
 * +e) 4.314E-04 V/m

2) Calculate the drift speed of electrons in a copper wire with a diameter of 2.72 mm carrying a 16.2 A current, given that there is one free electron per copper atom. The density of copper is 8.80 x 103kg/m3 and the atomic mass of copper is 63.54 g/mol. Avagadro's number is 6.02 x 1023atoms/mol.


 * +a) 2.087E-04 m/s
 * -b) 2.295E-04 m/s
 * -c) 2.525E-04 m/s
 * -d) 2.777E-04 m/s
 * -e) 3.055E-04 m/s

3) What is the average current involved when a truck battery sets in motion 559 C of charge in 4.13 s while starting an engine?


 * -a) 9.245E+01 A
 * -b) 1.017E+02 A
 * -c) 1.119E+02 A
 * -d) 1.230E+02 A
 * +e) 1.354E+02 A

4) A DC winch moter draws 18 amps at 126 volts as it lifts a 5.830E+03 N weight at a constant speed of 0.26 m/s. Assuming that all the electrical power is either converted into gravitational potential energy or ohmically heats the motor's coils, calculate the coil's resistance.


 * -a) 1.919E+00 &Omega;
 * -b) 2.111E+00 &Omega;
 * +c) 2.322E+00 &Omega;
 * -d) 2.554E+00 &Omega;
 * -e) 2.809E+00 &Omega;

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Key: X2
1) A DC winch moter draws 27 amps at 190 volts as it lifts a 4.910E+03 N weight at a constant speed of 0.769 m/s. Assuming that all the electrical power is either converted into gravitational potential energy or ohmically heats the motor's coils, calculate the coil's resistance.


 * -a) 1.396E+00 &Omega;
 * -b) 1.535E+00 &Omega;
 * -c) 1.689E+00 &Omega;
 * +d) 1.858E+00 &Omega;
 * -e) 2.043E+00 &Omega;

2) Calculate the drift speed of electrons in a copper wire with a diameter of 5.71 mm carrying a 7.54 A current, given that there is one free electron per copper atom. The density of copper is 8.80 x 103kg/m3 and the atomic mass of copper is 63.54 g/mol. Avagadro's number is 6.02 x 1023atoms/mol.


 * +a) 2.204E-05 m/s
 * -b) 2.424E-05 m/s
 * -c) 2.667E-05 m/s
 * -d) 2.933E-05 m/s
 * -e) 3.227E-05 m/s

3) Calculate the electric field in a 12-gauge copper wire that is 21 m long and carries a current of 42 mA. The resistivity of copper is 1.680E-08 &Omega;&middot;m and 12-gauge wire as a cross-sectional area of 3.31 mm2.


 * -a) 1.602E-04 V/m
 * -b) 1.762E-04 V/m
 * -c) 1.938E-04 V/m
 * +d) 2.132E-04 V/m
 * -e) 2.345E-04 V/m

4) What is the average current involved when a truck battery sets in motion 682 C of charge in 5.29 s while starting an engine?


 * -a) 1.065E+02 A
 * -b) 1.172E+02 A
 * +c) 1.289E+02 A
 * -d) 1.418E+02 A
 * -e) 1.560E+02 A

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Key: Y0
1) Imagine a substance could be made into a very hot filament. Suppose the resitance is 4.08 &Omega; at a temperature of 26&deg;C and that the temperature coefficient of expansion is 4.800E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 388 &deg;C?


 * -a) 1.064E+01 &Omega;
 * +b) 1.117E+01 &Omega;
 * -c) 1.173E+01 &Omega;
 * -d) 1.231E+01 &Omega;
 * -e) 1.293E+01 &Omega;

2) A DC winch moter draws 12 amps at 129 volts as it lifts a 4.210E+03 N weight at a constant speed of 0.318 m/s. Assuming that all the electrical power is either converted into gravitational potential energy or ohmically heats the motor's coils, calculate the coil's resistance.


 * -a) 9.924E-01 &Omega;
 * -b) 1.092E+00 &Omega;
 * -c) 1.201E+00 &Omega;
 * -d) 1.321E+00 &Omega;
 * +e) 1.453E+00 &Omega;

3) A make-believe metal has a density of 1.510E+04 kg/m3 and an atomic mass of 33.6 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * -a) 2.236E+29 e&minus;/m3
 * -b) 2.459E+29 e&minus;/m3
 * +c) 2.705E+29 e&minus;/m3
 * -d) 2.976E+29 e&minus;/m3
 * -e) 3.274E+29 e&minus;/m3

4) What is consumer cost to operate one 57&minus;W incandescent bulb for 11 hours per day for 1 year (365 days) if the cost of electricity is $0.146 per kilowatt-hour?


 * -a) $2.282E+01
 * -b) $2.510E+01
 * -c) $2.761E+01
 * -d) $3.038E+01
 * +e) $3.341E+01

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Key: Y1
1) Imagine a substance could be made into a very hot filament. Suppose the resitance is 6.06 &Omega; at a temperature of 80&deg;C and that the temperature coefficient of expansion is 4.290E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 330 &deg;C?


 * -a) 1.196E+01 &Omega;
 * +b) 1.256E+01 &Omega;
 * -c) 1.319E+01 &Omega;
 * -d) 1.385E+01 &Omega;
 * -e) 1.454E+01 &Omega;

2) A make-believe metal has a density of 1.050E+04 kg/m3 and an atomic mass of 58.8 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * +a) 1.075E+29 e&minus;/m3
 * -b) 1.183E+29 e&minus;/m3
 * -c) 1.301E+29 e&minus;/m3
 * -d) 1.431E+29 e&minus;/m3
 * -e) 1.574E+29 e&minus;/m3

3) What is consumer cost to operate one 104&minus;W incandescent bulb for 6 hours per day for 1 year (365 days) if the cost of electricity is $0.136 per kilowatt-hour?


 * -a) $2.116E+01
 * -b) $2.327E+01
 * -c) $2.560E+01
 * -d) $2.816E+01
 * +e) $3.098E+01

4) A DC winch moter draws 17 amps at 187 volts as it lifts a 5.600E+03 N weight at a constant speed of 0.381 m/s. Assuming that all the electrical power is either converted into gravitational potential energy or ohmically heats the motor's coils, calculate the coil's resistance.


 * -a) 2.471E+00 &Omega;
 * -b) 2.718E+00 &Omega;
 * -c) 2.990E+00 &Omega;
 * -d) 3.288E+00 &Omega;
 * +e) 3.617E+00 &Omega;

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Key: Y2
1) A DC winch moter draws 20 amps at 169 volts as it lifts a 5.120E+03 N weight at a constant speed of 0.543 m/s. Assuming that all the electrical power is either converted into gravitational potential energy or ohmically heats the motor's coils, calculate the coil's resistance.


 * +a) 1.500E+00 &Omega;
 * -b) 1.650E+00 &Omega;
 * -c) 1.815E+00 &Omega;
 * -d) 1.996E+00 &Omega;
 * -e) 2.196E+00 &Omega;

2) What is consumer cost to operate one 115&minus;W incandescent bulb for 12 hours per day for 1 year (365 days) if the cost of electricity is $0.128 per kilowatt-hour?


 * -a) $5.328E+01
 * -b) $5.861E+01
 * +c) $6.447E+01
 * -d) $7.092E+01
 * -e) $7.801E+01

3) Imagine a substance could be made into a very hot filament. Suppose the resitance is 4.08 &Omega; at a temperature of 26&deg;C and that the temperature coefficient of expansion is 4.800E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 388 &deg;C?


 * -a) 1.064E+01 &Omega;
 * +b) 1.117E+01 &Omega;
 * -c) 1.173E+01 &Omega;
 * -d) 1.231E+01 &Omega;
 * -e) 1.293E+01 &Omega;

4) A make-believe metal has a density of 1.300E+04 kg/m3 and an atomic mass of 75.7 g/mol. Taking Avogadro's number to be 6.020E+23 atoms/mol and assuming one free electron per atom, calculate the number of free electrons per cubic meter.


 * -a) 9.398E+28 e&minus;/m3
 * +b) 1.034E+29 e&minus;/m3
 * -c) 1.137E+29 e&minus;/m3
 * -d) 1.251E+29 e&minus;/m3
 * -e) 1.376E+29 e&minus;/m3

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Key: Z0
1) What is consumer cost to operate one 74&minus;W incandescent bulb for 9 hours per day for 1 year (365 days) if the cost of electricity is $0.119 per kilowatt-hour?


 * -a) $1.976E+01
 * -b) $2.173E+01
 * -c) $2.391E+01
 * -d) $2.630E+01
 * +e) $2.893E+01

2) Imagine a substance could be made into a very hot filament. Suppose the resitance is 1.52 &Omega; at a temperature of 45&deg;C and that the temperature coefficient of expansion is 4.330E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 479 &deg;C?


 * -a) 3.970E+00 &Omega;
 * -b) 4.168E+00 &Omega;
 * +c) 4.376E+00 &Omega;
 * -d) 4.595E+00 &Omega;
 * -e) 4.825E+00 &Omega;

3) Calculate the drift speed of electrons in a copper wire with a diameter of 5.46 mm carrying a 8.19 A current, given that there is one free electron per copper atom. The density of copper is 8.80 x 103kg/m3 and the atomic mass of copper is 63.54 g/mol. Avagadro's number is 6.02 x 1023atoms/mol.


 * -a) 2.380E-05 m/s
 * +b) 2.618E-05 m/s
 * -c) 2.880E-05 m/s
 * -d) 3.168E-05 m/s
 * -e) 3.485E-05 m/s

4) A device requires consumes 73 W of power and requires 9.14 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * -a) 1.187E+06 A/m2
 * -b) 1.306E+06 A/m2
 * -c) 1.436E+06 A/m2
 * -d) 1.580E+06 A/m2
 * +e) 1.738E+06 A/m2

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Key: Z1
1) What is consumer cost to operate one 74&minus;W incandescent bulb for 9 hours per day for 1 year (365 days) if the cost of electricity is $0.119 per kilowatt-hour?


 * -a) $1.976E+01
 * -b) $2.173E+01
 * -c) $2.391E+01
 * -d) $2.630E+01
 * +e) $2.893E+01

2) Calculate the drift speed of electrons in a copper wire with a diameter of 5.33 mm carrying a 5.1 A current, given that there is one free electron per copper atom. The density of copper is 8.80 x 103kg/m3 and the atomic mass of copper is 63.54 g/mol. Avagadro's number is 6.02 x 1023atoms/mol.


 * +a) 1.711E-05 m/s
 * -b) 1.882E-05 m/s
 * -c) 2.070E-05 m/s
 * -d) 2.277E-05 m/s
 * -e) 2.505E-05 m/s

3) A device requires consumes 177 W of power and requires 6.82 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * -a) 9.741E+05 A/m2
 * -b) 1.072E+06 A/m2
 * -c) 1.179E+06 A/m2
 * +d) 1.297E+06 A/m2
 * -e) 1.426E+06 A/m2

4) Imagine a substance could be made into a very hot filament. Suppose the resitance is 3.58 &Omega; at a temperature of 24&deg;C and that the temperature coefficient of expansion is 5.520E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 349 &deg;C?


 * -a) 9.526E+00 &Omega;
 * +b) 1.000E+01 &Omega;
 * -c) 1.050E+01 &Omega;
 * -d) 1.103E+01 &Omega;
 * -e) 1.158E+01 &Omega;

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Key: Z2
1) Calculate the drift speed of electrons in a copper wire with a diameter of 5.47 mm carrying a 3.48 A current, given that there is one free electron per copper atom. The density of copper is 8.80 x 103kg/m3 and the atomic mass of copper is 63.54 g/mol. Avagadro's number is 6.02 x 1023atoms/mol.


 * -a) 1.008E-05 m/s
 * +b) 1.108E-05 m/s
 * -c) 1.219E-05 m/s
 * -d) 1.341E-05 m/s
 * -e) 1.475E-05 m/s

2) Imagine a substance could be made into a very hot filament. Suppose the resitance is 4.08 &Omega; at a temperature of 26&deg;C and that the temperature coefficient of expansion is 4.800E-03 (&deg;C)&minus;1). What is the resistance at a temperature of 388 &deg;C?


 * -a) 1.064E+01 &Omega;
 * +b) 1.117E+01 &Omega;
 * -c) 1.173E+01 &Omega;
 * -d) 1.231E+01 &Omega;
 * -e) 1.293E+01 &Omega;

3) What is consumer cost to operate one 77&minus;W incandescent bulb for 12 hours per day for 1 year (365 days) if the cost of electricity is $0.124 per kilowatt-hour?


 * -a) $3.142E+01
 * -b) $3.456E+01
 * -c) $3.802E+01
 * +d) $4.182E+01
 * -e) $4.600E+01

4) A device requires consumes 72 W of power and requires 11.7 A of current which is supplied by a single core 10-guage (2.588 mm diameter) wire. Find the magnitude of the average current density.


 * -a) 1.519E+06 A/m2
 * -b) 1.671E+06 A/m2
 * -c) 1.838E+06 A/m2
 * -d) 2.022E+06 A/m2
 * +e) 2.224E+06 A/m2

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