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Had a quick look on alot of sites but most do not insure surfs and if they do they are really expensive.

A charge q1 of −5.00×10−9 C and a charge q2 of −2.10×10−9 C are separated by a distance of 41.0 cm. Find the equilibrium position for a third charge of +13.0 × 10−9 C by identifying its distance from q1. Answer in units of cm. I have no idea how to work this. Any help would be great. :)

It goes into reverse the signal comes on but it will not move. Any suggestions to what the problem could be. Thanks