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**1. The problem statement, all variables and given/known data**

What would be the angle theta as shown in the picture, if the 5 gram balls hangin off 1m strings have been charges to 100nC each

http://img178.imageshack.us/img178/5103/mooche.th.jpg [Broken]

**3. The attempt at a solution**

I'm not really sure how to solve such a question, can i get a hint?

i know the force each one exerts on the other is kq1q2 / r^2 and i can find that the distance between them is 2sin(theta) so the force is kq1q2/(2sin(theta))^2

So for , say, the left ball, we have

Fx = Tsintheta - kq1q2/(2costheta)^2 = 0

Fy = tcostheta - mg = 0

but what can i do with those eqations really :S

I definitely am stuck and have no idea how to proceed for such a q

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