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Question

There is a spherical cavity of radius R/2 in uniformly charged spherical region having charge density r and radius R. A small charged particle having q0 charge is released at point 0. It will collide with the wall of cavity with kinetic energy
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Solution

E=ρR23t0=ρR6t0F=ρRq06E0a=ρRq06t0mv20=2×ρR2q06t0m×R2v2=ρR2q06t0mmv22=ρR2q012t0KE=ρR2q012t0

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