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A particle with charge Q coulomb, tied a...

A particle with charge Q coulomb, tied at the end of an inextensible string of length R metre, revolves in a vertical plane. At the centre of the circular trajectory, there is a fixed charge of magnitude Q coulomb . The mass of the moving charge M is such that `Mg=Q^2/(4pivarepsilon_0R^2)`. If at the highest position of the particle, the tension of the string just vanishes, the horizontal velocity at the lowest point has to be

A

0

B

`2sqrt(gR)`

C

`sqrt(2gR)`

D

`sqrt(5gR)`

Text Solution

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The correct Answer is:
B
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