Question

Consider an evacuated cylindrical chamber of height h having rigid conducting plates at the ends and an insulating
curved surface as shown in the figure. A number of spherical balls made of a light weight and soft material and
coated with a conducting material are placed on the bottom plate. The balls have a radius r << h. Now a high voltage
source (HV) is connected across the conducting plates such that the bottom plate is at +V₀ and the top plate at –V₀.
Due to their conducting surface, the balls will get charged, will become equipotential with the plate and are repelled
by it. The balls will eventually collide with the top plate, where the coefficient of restitution can be taken to be zero
due to the soft nature of the material of the balls. The electric field in the chamber can be considered to be that of a
parallel plate capacitor. Assume that there are no collisions between the balls and the interaction between them is
negligible. (Ignore gravity)"
The average current in the steady state registered by the ammeter in the circuit will be
(A) proportional to V₀¹/² (B) proportional to V²₀
(C) proportional to the potential V₀ (D) zero

Answer 1

Answer:

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