ElectrostaticsHard

Question

The diagram show a small bead of mass m carrying charge q. The bead can freely move on the smooth fused ring placed on a smooth horizontal plane. In the same plane a charge + Q has also been fixed as shown. The potential at the point A due to + Q is V. The velocity with which the bead could projected from the point A so that it can complete a circle should be greater than :

Options

A.
B.
C.
D.none of these

Solution

Given VA due to +Q is V, so VB = 4V
By energy conservation
mu2 + qV = 4qV

⇒ u =

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