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(C) $1$. Intensity of magnetization $(I)$ is defined as the magnetic moment per unit volume. Since both the magnetic moment and the volume are halved

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$b$ and $c$

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(C) $1$. Intensity of magnetization $(I)$ is defined as the magnetic moment per unit volume. Since both the magnetic moment and the volume are halved when the magnet is cut,the ratio remains constant. Thus,$I$ does not change.$2$. Pole strength $(m)$ is a property related to the cross-sectional area of the magnet. If the magnet is cut perpendicular to its length,the pole strength remains the same. If cut parallel to its length,the pole strength is halved. Therefore,it may change.$3$. Magnetic moment $(M = m 	imes 2l)$ depends on both pole strength and length. Cutting the magnet changes either the length or the pole strength (or both),so the magnetic moment always changes.$4$. Thus,both pole strength and magnetic moment may change.

$A$ bar magnet is cut into two equal parts. Then,which of the following quantities may change?

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