Question

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

(a) zero

(b) 1/2(K - 1)CV²

(c) CV₂(K - 1)/K

(d) (K - 1)CV²

Answer 1

(a) : The potential energy of a charged capacitor