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[" Example "5" A non-conducting disc of ...

[" Example "5" A non-conducting disc of radius a and uniform positive surface charge "],[" density "sigma" 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 varepsilon_(0)g/ sigma" ."],[" (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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