# Magnetic Properties of Materials

Magnetic permeability:

It is the ability of a material to permit the passage of magnetic lines of force through it.

Magnetising force or magnetic intensity:

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

Intensity of magnetisation:

The magnetic dipole moment developed per unit volume of the material is called intensity of magnetisation.

Magnetic susceptibility:

The ratio of the intensity of magnetisation induced in the material to the magnetising force applied is called magnetic susceptibility.

Depending up on the magnetic properties, materials are 3 types

They are    i) Diamagnetic substances

ii) Paramagnetic substances

iii) ferromagnetic substances

### View the Topic in this video From 00:57 To 58:51

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1. The magnetisation of a paramagnetic material is inversely proportional to the absolute temperature T, M = C \frac{B_{0}}{T}

2. The constant C is called Curie's constant. Thus, for a paramagnetic material both X and μr depend not only on the material.
X = C \frac{\mu_{0}}{T}

3. The Ferromagnetic property depends on temperature. At high enough temperature, a ferromagnet becomes a paramagnet.
X = \frac{C}{T - T_{c}}(T > T_{c})