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A non-conducting disc of radius a and uniform positive surface charge density s 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 = 4 Î 0 g/ s . (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.

A non-conducting disc of radius a and uniform positive surface charge density s 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 = 4Î0g/s
(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. 

Grade:6

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