1.Suppose two +1.0 nC charges are separated by 0.5 m from each other along the x

Question

1.Suppose two +1.0 nC charges are separated by 0.5 m from each other along the x-axis. Calculate

the net electric field (magnitude and direction) 0.5 m to the right of the charge on the right side

of the configuration.

2. For the above problem, what is the net force on a test charge of -1.0 nC placed at the net field

point?

1. A) 15 N/C               B) 25 N/C               C) 35 N/C               D) 45 N/C               E) 60 N/C

2. A) 15 nN to the right        B) 15 nN to the left           C) 45 nN to the right        D) 45 nN to the left

Explanation / Answer

Number 1)

Apply E = kq/r2 for each charge

E = (9 X 109)(1 X 10-9)/(1)2 + (9 X 109)(1 X 10-9)/(.5)2

E = 45 N/C (Choice D)

Number 2)

F = qE

F = (1 X 10-9)(45)

F = 45 nN to the left (since the charge is negative)

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