Homework Help: Physics

Posted by Alex on Monday, April 21, 2008 at 12:28am.

Neutral metal sphere A, of mass 0.10kg, hangs from an insulating wire 2.0m long. An identical metal sphere B, with charge -q is brought into contact with sphere A. Sphere A goes 12 degrees away from Sphere B and there is a 90 degree angle at Sphere B. Calculate the initial charge on Sphere B.

Note: when one object with charge Q is brought in contact with a neutral object 1/2 the charge is transferred to the neutral object.

I don't understand how to do this.
Ans: 3.9x10^-6C

Physics - bobpursley, Monday, April 21, 2008 at 7:18am
What do you mean a 90 degree angle at sphere B? Ninety degrees between what and what? I assume the 12 degrees is measured between A and B.

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