Ian G.

asked • 04/26/17

Potential Energy between charges

A positive charge of 3 nC is placed at the origin and a positive charge of 6.75 nC is
placed on the x-axis 5 cm. A positive test charge of 2 nC is placed on the x-axis a
distance d, between these two charges.
 
When the test charge is placed at 2cm what is the force and the potential energy at this point?
 
The Force is 0N i am 100% sure.
 
I have tried to work out the potential energy but my answer differs from the one provided. My attempt is
 
 U = ∑ kQ1Q2/r
 
Doing the sum of these I got my answer to be 6.74x10-6 J
 
The answer provided is 2.74x10-6 J

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