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An insulating rod of length I carries a ...

An insulating rod of length I carries a charge q distrubuted uniformly on it. The rod is pivoted at its mid-point and is rotated at a frequency f about a fixed axis perpendicular to the the rod and passing through the pivot . The magnetic moment of the rod system is

A

`(pi qf l^(2))/(12)`

B

`(pi qfl^(2))/(2)`

C

`(pi qfl^(2))/(6)`

D

`(pi qfl^(2))/(3)`

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