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The diagram show a small bead of mass m ...

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

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Verified by Experts

The correct Answer is:
A
Given `V_(A)` due to `+Q` is V, so `V_(B)=4V`
By energy conservation
`1/2 m u^(2)+qV=4qV`
`rArr u=sqrt((6qV)/m)`
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ALLEN -MISCELLANEOUS-Exercise-02
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