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A uniformly charged solid sphere a mass ...

A uniformly charged solid sphere a mass M, radius R having charge Q is rotated about its diameter with frequency `f_0`. The magnetic moment of the sphere is

A

`(4pi/5)f_0QR^2`

B

`(2pi/5)f_0QR^2`

C

`(pi/5)f_0QR^2`

D

`(pi/2)f_0QR^2`

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