Three metallic spheres say X, Y and Z have charges 10 C,-10 C, 10 C, respectively. X, Y and Z are brought in contact such that charge on both X and Y becomes 3 C. What is charge on Z ?

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1 C

2 C

3 C

4 C

answer is D.

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Detailed Solution

The net charge initially on X, Y and Z is(10-10+10) = 10 CLet final net charge on X, Y and Z isqx + qy + qz = 3+3+qz = 10 CTherefore, qz = 4 C.

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