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Q.

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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a

force on charge q placed inside the cavity will change

b

only induced charge on outer surface will redistribute

c

only induced charge on inner surface will redistribute

d

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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