Q.

A capacitor is kept connected to the battery and a dielectric slab is inserted between the plates. During this process

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a

No work is done

b

Work is done at the cost of the energy already stored in the capacitor before the slab is inserted

c

Work is done at the cost of the battery

d

Work is done at the cost of both the capacitor and the battery

answer is C.

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Detailed Solution

In this process capacity increases, so battery supplies additional charge to capacitor.
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