A parallel plate condenser with plate separation 'd' and plate are A is connected to a battery and charged to a potential V. Then the battery is disconnected and with insulated handles the plate separation is increased to 2d. Work done in the process is

Options

A. `(epsilon_0A)/(4d)V^2`
B. `(epsilon_0A)/dV^2`
C. `(epsilon_0A)/(2d)V^2`
D. `(2epsilon_0A)/dV^2`

Answer

C