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Define magnetisation (M) and give its un...

Define magnetisation (M) and give its unit and dimension.

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Magnetisation M of a sample to be equal to its net magnetic moment per unit volume.
`overset(to) (M) = (overset(to) (m_("net") ))/( V) " "…(1)`
M is a vector.
Dimension of M is `L^(-1)` A.
Unit is A/m.
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