One plate of a capacitor is fixed, and the other is connected to a spring as shown in. Area of both the plates is `A` In strady state (equilibrium), separation between the plates is `0.8d` (spring was unstretched , and the distance between the plates was `d` when capacitor was uncharged). The force conntant of the spring is approximately.

Options

A. 5`(epsi_0 AE^(2))/( 2d^3)`
B. `(65)/(32) (epsi_0 AE^(2))/( d^3)`
C. `(125)/( 16) ( epsi_0 AE^2)/(d^3)`
D. `(125)/(32)(epsi_0 AE^(2))/( d^3)`

Answer

D