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A bar magnet of magnetic dipole moment 8...

A bar magnet of magnetic dipole moment 8 `Am^(2)` has poles separated by `0.4` m . Find the pole strength of bar magnet .

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`M = q_(m) xx L`
`B = q_(m) xx 0.4`
`q_(m) = (8)/(0.4) = 20` Am
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