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

Options

A. `1/2(k-1)CV^2`
B. `CV^2(K-1)//K`
C. `(K-1)CV^2`
D. zero

Answer

A