Q.

A parallel plate capacitor is connected across a battery. Now, keeping the battery connected, a dielectric slab is inserted between the plates. In this process,

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a

work is done by the external agent, and the stored energy decreases

b

no work is done

c

work is done by the battery, and the stored energy increases

d

work is done by the battery as well as the external agent, but the stored energy does not change

answer is B.

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Detailed Solution

Extra charge will flow through battery, so work is done by battery. External agent will do negative work.

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