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A small charged ball having mass m and c...

A small charged ball having mass m and charge q is suspended from a rigid support by means of an inextensible thread of length l. It is made to rotate on a horizontal circular path in a uniform, time independent magnetic field of induction B which is directed upward. The time period of revolution of the ball is `T_0.` If the thread is always stretched, calculate the radius of circular path on which the ball moves.

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