A smooth tunnel is made in a sphere of radius R along its diameter. The uniform volume charge density is rho. A charge sphere particle of mass m and charge -q is placed at the centre of the sphere. The time period of motion of -q when displaced by small displacement from its centre is

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A small particle of charge q is displaced from the centre of a uniformly charged solid sphere of radius R and charge Q to an outside point at a distance R from the surface of sphere... Find the word done.

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