In the given figure a capacitor of plate are `A` is charged upto charge `q`. The mass of each plate is `m_(2)`. The lower plate is rigidly fixed. The value of `m_(1)` if the system remains in equilibrium is.
.

Options

A. `m_(2)+(q^(2))/(in_(0)Ag)`
B. `m_(2)`
C. `(q^(2))/(in_(0)Ag)`
D. `2m_(2)`

Answer

C

Explanation

`T=m_(1)g and T= mg_(2)g +F_(e) , :. m_(1) g=m_(2)g +F_(e)`
Here, `F_(e)=(q^(2))/(2 in_(0)A)`.