Two parallel plate capacitors with area `A` are connected through a conducting spring of natural length `l` in series as shown. Plates `P` and `Q` have fixed positions at separation `d`. Now the plates are connected by a battery of `emf xi` as shown. If the extension in the spring in equilibrium is equal to the separation between the plates, find the spring constant `k`.
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Two parallel plate capacitors with area A are connected through a conducting spring of natural length 1 in series as shown. Plates P and save fixed positions at separation d . Now the plates are connected by a battery of emf xi as shown. If the extension in the spring in equilibrium is equal to the separation between the plates, find the spring constant k . .

A paallel plate capacitor with air as a dielectric is arranged horizontally. The lower plate is fixed and the other connected with a perpendicular spring. The area of each plate is A and mass of uppar plate is m . In the steady position, the distance between the plates is d_(0) . When the capacitor is connected with a battery of emf V , a new equilibrium appears, with distance between the plate as d . (a) find the spring constant k . (b) what is the maximum voltage for a given k in which an equilibrium is possible?

Area of each plate is A . The conducting plates are connected to a battery of emf V volts. Find charges q_1 to q_t .

A pallel -plate capacitor whith the plate area 100cm^2 and the separation between the plate 1.0cm is connected across a battery of emf 24 volts .Find the force of attraction between the plates.

In a parallel-plate capacitor of plate area A , plate separation d and charge Q the force of attraction between the plates is F .

Two charged capacitors have their outer plates fixed and inner plates connected by a spring of force constant k. The magnitude of charge on each capacitor is q and sign of charge on each capacitor is q and sign of charge is shown in figure. Find the extension in the spring at equilibrium.

Two parallel plate capacitors are filled with dielectrics and connected speparately across same potential difference as shown in figure. Their plate area is A and separation between plates is 'd' . Then the ration of energy stored is: