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(A) The magnetic moment $M$ of a bar magnet is given by the product of its pole strength $m$ and its magnetic length $2l$,so $M = m 	imes 2l$.When th

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$0.5$

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(A) The magnetic moment $M$ of a bar magnet is given by the product of its pole strength $m$ and its magnetic length $2l$,so $M = m 	imes 2l$.When the magnet is cut into two equal parts perpendicular to its length,the pole strength $m$ of each part remains the same,but the length of each part becomes half,i.e.,$l' = l$.Therefore,the new magnetic moment $M'$ of each part is $M' = m 	imes l = (m 	imes 2l) / 2 = M / 2$.Thus,$M' = 0.5 M$.

$A$ bar magnet of magnetic moment $M$ is cut into two parts of equal length. The magnetic moment of each part will be ......... $M$.

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