If a hole is made at the centre of a bar magn | vedclass

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(C) The magnetic moment $M$ of a bar magnet is defined as the product of its pole strength $m$ and the magnetic length $2l$,given by $M = m 	imes 2l$

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(C) The magnetic moment $M$ of a bar magnet is defined as the product of its pole strength $m$ and the magnetic length $2l$,given by $M = m 	imes 2l$.When a hole is made at the centre of the bar magnet,the material of the magnet is removed from the central region.However,the pole strength $m$ depends on the magnetic material at the ends of the magnet,which remains unaffected by a hole at the centre.The magnetic length $2l$ (the distance between the poles) also remains unchanged.Since both the pole strength and the magnetic length remain constant,the magnetic moment $M$ of the bar magnet does not change.

If a hole is made at the centre of a bar magnet,then its magnetic moment will

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