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

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force on charge q placed inside the cavity will change

only induced charge on outer surface will redistribute

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

External electric fields cannot penetrate a closed conductor because of electrostatic shielding. So the charge distribution on the inside surface will remain unchanged.

only induced charge on outer surface will redistribute.

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