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A charge +Q is uniformly distributed ove...

A charge +Q is uniformly distributed over a thin ring of a radius R. Find the velocity of a negative point charge -Q at the moment it passes through the centre of the ring if it was initially at rest at infinity on the axis of the ring. The mass of the charge-Q is equal to m.

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The correct Answer is:
`v=sqrt(1/(4piepsi_0)(2Q^2)/(Rm)`
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NN GHOSH-ELECTRIC FIELD AND POTENIAL-EXERCISE-B
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