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A particle of mass 1 kg and charge 1//3 ...

A particle of mass `1 kg` and charge `1//3 mu C` is projected toward a nonconducing fixed spherical shell of radius `r = 1 mm` having the same charge uniformly distributed on its surface. Find the minimum initial velocity of projection requires if the particle just grazes the shell.
.

A

`sqrt(2/3) ms^(-1)`

B

`2sqrt(2/3) ms^(-1)`

C

`2/3 ms^(-1)`

D

`1 ms^(-1)`

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The correct Answer is:
B
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