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JEE Main 10 Jan 2019 Shift 1 Solved Paper

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Question : 20

Total: 90

An insulating thin rod of length l has a x linear charge density p(x) = ρ0

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 magneticmoment of the rod is :

π
4
nρl3
nρl3
πnρl3
π
3
nρl3

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