A parallel plate capacitor ils arrranged horizontally in a mechanical situation with the lower plate is fixed and the other connected with a perpendicular spring as shown in figure. The area of eachh plate is `A` and in equilibrium the distance between te plates is `d_(0)`. WHen the capacitor is connected with a source of voltage `V`, a new equilibrium appears after some displacement in upper plate with the new distasnce between the plates `d_(1)`. Given that mass of the upper plate is m. then find the spring constant k . .