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Physics Help

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Hey, ok so I am supposed to be helping my cousin this with this physics problem, and this is the only one that has ever stumped me! Neutral metal spheres A and B each of mass 0.2 kg hang from insulating wires that are 4.0 m long and are initially touching. An identical metal sphere C, with a charge of -6.0 x 10^-6C is brought into contact with both spheres simultaneously and then removed. Spheres A and B then repel. What is the angle between the wires? Note>> use small angle approximation Tan theta is approximately equal to sin theta. I think I the answer is 9.6 or 9.4 degrees, roughly, but please help me!! Thanks!

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