# A parallel plate air capacitor has capacity $‘C’$, distance of separation between plates is $‘d’$ and potential difference $‘V’$ is applied between the plates. Force of attraction between the plates of the parallel plate air capacitor is :
( A ) $\frac{CV^2}{2d}$
( B ) $\frac{C^2V^2}{2d^2}$
( C ) $\frac{CV^2}{d}$
( D ) $\frac{C^2V^2}{2d}$