How to make an approach?

How to make an approach? A cavity of radius r is present inside a solid dielectric sphere of radius R, having a volume charge density of p. The distance between the centres of the sphere and the cavity is a. An electron e is kept inside the cavity at an angle 0 = 450 as shown. The electron (mass m and charge —e) touches the sphere again after 1/2 pVä ? Find the value of P. Neglect gravity. time ear A solid conductor sphere having a charge Q is surrounded by an uncharged concentric hollow spherical shell. Let the potential difference between the surface of the solid sphere and

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