One plate of a capacitor is fixed, and t...

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.

`(4epsilon_0AE^2)/d^3`

`(2epsilon_0AE^2)/d^2`

`(6epsilon_0AE^2)/(Ad^3)`

`(epsilon_0AE^3)/(2d^3)`

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