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

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No work is done

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

Work is done at the cost of the battery

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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