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JEE Main 2007 (AIEEE) · Dielectrics

Dielectrics question from JEE Main 2007 (AIEEE)

Q112JEE Main 2007 · AIEEEMedium

Dielectrics

A parallel plate condenser with a dielectric of dielectric constant $K$ between the plates has a capacity $C$ and is charged to a potential $V$ volt. The dielectric slab is slowly removed from between the plates and then reinserted. The net work done by the system in this process is

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Answer: (a)

After removing and reinserting the slab, the capacitor returns to the same $C$ , $Q$ and $V$ .
Initial and final stored energy are equal, so $\Delta U=0$ .
Net work done by the system $=0$ . So the answer is (a) zero.

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