The figure shows a charge q placed inside a cavity C in an uncharged conductor. Now if an external electric field is switched on then:

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Only induced charge on outer surface will redistribute.

Force on charge q placed inside the cavity will change

Only induced charge on inner surface will redistribute

Both induced charge on outer and inner surface will redistribute

answer is A.

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Detailed Solution

The distribution of charge on the outer surface, depends only on the charges outside, and it distributes itself such that the net electric field inside the outer surface due to the charge on outer surface and all the outer charges is zero. Similarly the distribution of charge on the inner surface, depends only on the charges inside the inner surface, and it distributes itself such that the net, electric field outside the inner surface due to the charge on inner surface and all the inner charges is zero. Also the force on charge inside the cavity is due to the charge on the inner surface. Hence answer is option (A).

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