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Q.

There is a cubical cavity inside a solid metallic sphere a charge Q is placed at the center of the cavity then answer the following questions
 

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What is the charge induced on the inner surface of cavity
 

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a

−(Q+q) ,  uniformly distributed

b

−Q , non-uniformly distributed

c

−(Q+q) , non-uniformly distributed

d

−Q , uniformly distributed

answer is B.

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Detailed Solution

Due to induction charge induced at inner surface of cavity = −Q  and it is non-uniformly distributed because different surface of cavity is at different distance from Q.

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