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A bullet of mass m and charge q is fired...

A bullet of mass m and charge q is fired towards a solid uniformly charge sphere of radius R and total charge +q. If it strikes the surface of sphere with speed u, find the minimum value of u so that it can penetrate through the sphere. (Neglect all resistance force or friction acting on bullet except electrostatic forces)

A

`(Q)/(sqrt(2 pi in_(0) mR))`

B

`(Q)/(sqrt(6 pi in_(0) mR))`

C

`(Q)/(sqrt(4 pi in_(0) mR))`

D

`(3Q)/(sqrt(4 pi in_(0) mR))`

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