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NEET 2020 (Phase 2) · Current Loop as a Magnetic Dipole

Current Loop as a Magnetic Dipole question from NEET 2020 (Phase 2)

Q59NEET 2020 · PHASE 2Easy

Current Loop as a Magnetic Dipole

A wire of length $L$ metre carrying a current of $I$ ampere is bent in the form of a circle. Its magnetic moment is

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Answer: (a)

$2\pi r = L \Rightarrow r = \frac{L}{2\pi}$
$A = \pi r^2 = \frac{L^2}{4\pi}$
$m = IA = \frac{IL^2}{4\pi}\text{ A m}^2$ , so the answer is (a).

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