Q 1115723669.     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` volts. The dielectric slab is slowly removed from between the plates and then reinserted. The net work done by the system in this process is

JEE 2007
A

`1/2(K-1)CV^2`

B

` ((K-1)CV^2)/K`

C

`(K-1)CV^2`

D

Zero

HINT

The potential Energy of a charged capacitor is given by `U=Q^2/(2C)

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