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.