MAGNETIC CLASSIFICATION OF SUBSTANCES

1.Para magnetic substances

2.Dia magnetic substances

3.Ferro magnetic substances

PARA MAGNETIC SUBSTANCES

para magnatic substances feebly magnetice in the direction of magnetising field.

It attracts towards the magnet when brought close to the pole of a powerfull magnet.

Magnetisation M is weak but in same direction of magnetising field.

It have small positive susceptivity.

Relative permiability is slightly greater than 1.

Alluminium,sodium,platinum,manganeese....

DIA MAGNETIC SUBSTANCES

dia magnetic substances  feebly magnetice opposite to the direction of magnetising field.

They reppel away from a magnet when brought close to a powerfull magnet.

Magnetisation M is weak directed opposite to the magnetic field.

The susceptivity of dia magnetic substances is small and negative

Relative permiablity is slightly less than 1.

Bismuth,zinc,copper,silver,gold.

FERRO MAGNETIC SUBSTANCES

ferro magnetic substances strongly magnetice in the direction of magnetising field.

Fastly attracted towards magnet.

Magnetisation M is strong and same direction as the magnetising field.

The susceptivity of ferro magnetic substances is large positive value.

Relative permiablity is the order of 100's and 1000's.

                                                                                 by praveen........

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