Quizbank/Electricity and Magnetism (calculus based)/QBCh10

QB153086031104

QB:Ch 10:V1
QB153086031104 1) Two sources of emf &epsilon;1=52.7 V, and  &epsilon;2=17.5 V are oriented as shownin the circuit. The resistances are R1=5.86 k&Omega; and  R2=2.08 k&Omega;.  Three other currents enter and exit or exit from portions of the circuit that lie outside the dotted rectangle and are not shown.  I3=3.48 mA and I4=0.988 mA enter and leave near R2, while the current I5 exits near R1.What is the magnitude (absolute value) of voltage drop across R1?
 * a) 2.064E+01 V
 * b) 2.270E+01 V
 * c) 2.497E+01 V
 * d) 2.747E+01 V
 * e) 3.021E+01 V

2) In the circuit shown the voltage across the capaciator is zero at time t=0 when a switch is closed putting the capacitor into contact with a power supply of 301 V.  If the combined external and internal resistance is 245 &Omega and the capacitance is  63 mF, how long will it take for the capacitor's voltage to reach 192.0 V?
 * a) 1.296E+01 s
 * b) 1.425E+01 s
 * c) 1.568E+01 s
 * d) 1.725E+01 s
 * e) 1.897E+01 s

3) A battery with a terminal voltage of 14.1 V is connected to a circuit consisting of 3 15.7 &Omega; resistors and one 10.2 &Omega; resistor. What is the voltage drop across the 10.2 &Omega; resistor?
 * a) 2.074E+00 V
 * b) 2.282E+00 V
 * c) 2.510E+00 V
 * d) 2.761E+00 V
 * e) 3.037E+00 V