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MHT CET 2021 (24 Sep, Shift 1) · Bar Magnet & Magnetic Moment

Bar Magnet & Magnetic Moment question from MHT CET 2021 (24 Sep, Shift 1)

Q8MHT CET 2021 · 24 SEP · SHIFT 1Medium

Bar Magnet & Magnetic Moment

A current ' $I$ ' is flowing in a conductor of length ' $L$ ' when it is bent in the form of a circular loop, its magnetic moment will be

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Answer: (d)

Loop of length $L$ : $2\pi r = L \Rightarrow r = \dfrac{L}{2\pi}$ .
Area $A = \pi r^2 = \dfrac{L^2}{4\pi}$ .
$M = IA = \dfrac{IL^2}{4\pi}$
So the answer is (d).

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