The unit of pole strength of a magnet is:

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(D) The magnetic dipole moment $(M)$ of a magnet is given by the product of its pole strength $(m)$ and the magnetic length $(2l)$: $M = m 	imes 2l$

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$Am$

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(D) The magnetic dipole moment $(M)$ of a magnet is given by the product of its pole strength $(m)$ and the magnetic length $(2l)$: $M = m 	imes 2l$ Also,the magnetic dipole moment is defined as the product of current $(I)$ and area $(A)$: $M = I 	imes A$ Equating the two expressions: $m 	imes 2l = I 	imes A$ Solving for pole strength $(m)$: $m = \frac{I 	imes A}{2l}$ The unit of current $(I)$ is Ampere $(A)$ and the unit of length $(l)$ is metre $(m)$. Therefore,the unit of pole strength $(m)$ is: $	ext{Unit} = \frac{	ext{Ampere} 	imes 	ext{metre}^2}{	ext{metre}} = 	ext{Ampere} 	imes 	ext{metre} = Am$

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