# Magnetisation and Magnetic Intensity

A circulating electron in an atom has a magnetic moment. In a bulk material, these moments add up vectorially and they can give a net magnetic moment which is non-zero. The magnetisation M of a sample to be equal to its net magnetic moment per unit volume

M=mnet/v

The degree up to which a magnetic field can magnetise a material is defined in terms of magnetic intensity.

Magnetic intensity (H) = B/µ

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1. We define magnetisation M of a sample to be equal to its net magnetic moment per unit volume:
\tt M = \frac{m_{net}}{V}

2. The total magnetic field 'B' is given by
B = μ0μr H H

3. The magnetic permeability of the substance is μ and it has the same dimensions and units as μ0;
μ = μ0μr = μ0 (1 + X)