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An insulating thin rod of length l has a linear charge density ρ(x) = ρ0 x/l on it. The rod is rotated about an axis passing through the origin (x = 0) and perpendicular to the rod.  If the rod makes n rotations per second, then the time averaged magnetic moment of the rod is :

(1) πnρl3

(2) π/4 nρl3

(3) nρl​​​​​​​3

(4) π/3 nρl​​​​​​​3

1 Answer

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Correct option: (2) π/4 nρl3


Magnetic Moment of small element

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