A non-conducting disc of radius ‘a’ and uniform positive surface charge density (rho) is placed on the ground, with its axis vertical. A particle of mass m and positive charge q is dropped, along the axis of the disc, from a height H with zero initial velocity. The particle has q/m = [(epsilon naut)g]/rho(take the sign representation)
(a) Find the value of H if the particle just reaches the disc.
(b) Sketch the potential energy of the particle as a function of its height and find its equilibrium position.
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