Physics equations/18-Electric charge and field/Q:findE

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Practice quiz
{What is the magnitude of the electric field at the origin if a 1.8 nC charge is placed at x = 7.9 m, and a 2.1 nC charge is placed at y = 7 m? -a) 2.61 x 10-1N/C -b) 3.02 x 10-1N/C -c) 3.48 x 10-1N/C -d) 4.02 x 10-1N/C +e) 4.64 x 10-1N/C
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{What angle does the electric field at the origin make with the x-axis if a 1.1 nC charge is placed at x = -6.5 m, and a 1.4  nC charge is placed at y = -8.3 m? +a) 3.8 x 101degrees -b) 4.39 x 101degrees -c) 5.06 x 101degrees -d) 5.85 x 101degrees -e) 6.75 x 101degrees
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{A dipole at the origin consists of charge Q placed at x = 0.5a, and charge of -Q placed at x = -0.5a. The absolute value of the x component of the electric field at (x,y) =( 6a, 4a) is &beta;kQ/a2, where &beta; equals -a) 1.33 x 10-3 -b) 1.61 x 10-3 -c) 1.95 x 10-3 -d) 2.37 x 10-3 +e) 2.87 x 10-3
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{A dipole at the origin consists of charge Q placed at x = 0.5a, and charge of -Q placed at x = -0.5a. The absolute value of the y component of the electric field at (x,y) =( 1.1a, 1.2a) is &beta;kQ/a2, where &beta; equals -a) 2.36 x 10-1 -b) 2.86 x 10-1 +c) 3.47 x 10-1 -d) 4.2 x 10-1 -e) 5.09 x 10-1
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