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

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Practice quiz

1. 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

2. 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

3. 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 βkQ/a2, where β 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

4. 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 βkQ/a2, where β 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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