The S.I. unit of pole strength is

$A m^{2}$

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$A m$

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$A m^{- 1}$

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$A m^{- 2}$

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Solution

The correct option is B
$A m$

Definition of Pole Strength: The magnetic pole strength can be defined as the ratio of the magnetic dipole moment and the length of the magnet.
S.I. unit of Pole Strength: The pole strength is measured in $A m$ .
Thus, option B is correct.

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