The energy required to charge a parallel plate condenser of plate separation d and plate area of cross-section A such that the uniform electric field between the plates is E, is :

Question

( A ) $\epsilon_0E^2 Ad$
( B ) $\epsilon_0\frac{E^2}{ Ad}$
( C ) $\frac{1}{2}\epsilon_0\frac{E^2}{ Ad}$
( D ) $\frac{1}{2}\epsilon_0E^2 Ad$