A bar magnet having magnetic moment M is bent | vedclass

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(A) The magnetic moment of a bar magnet is given by $M = m 	imes (2l)$, where $m$ is the pole strength and $(2l)$ is the distance between the poles (

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decreases

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(A) The magnetic moment of a bar magnet is given by $M = m 	imes (2l)$, where $m$ is the pole strength and $(2l)$ is the distance between the poles (magnetic length). When the bar magnet is bent into an arc, the pole strength $m$ remains constant, but the straight-line distance between the two poles decreases. Since the magnetic moment is directly proportional to the distance between the poles, the new magnetic moment $M'$ will be less than the original magnetic moment $M$. Therefore, the magnetic moment decreases.

$A$ bar magnet having magnetic moment $M$ is bent as an arc. Its magnetic moment

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