Discuss briefly the characteristic of diamagnetic, paramagnetic and ferromagnetic materials. Also, give some examples of the three magnetic materials.

(i) Diamagnetic Substances e.g. Bismuth, Copper, Gold, Quartz.

Properties:

a) When placed in magnetising field the magnetic lines of force do not pass through it.

b) Permeability is always less than unity and susceptibility is negative.

c) When placed in non uniform magnetic field the substance move from stronger parts of the field to the weaker parts of the field.

d) The level of diamagnetic liquid in U-tube is depressed, instead of rising when subjected to magnetic field.

       

(ii) Paramagnetic Substances e.g. Platinum, Crown Glass, Chromium, Manganese.

Properties:

a) When placed in magnetising field the magnetic lines of force pass through it.

b) Permeability is greater than unity and susceptibility is positive.

c) When placed in non uniform magnetic field the substance move from weaker parts of the field to the stronger parts of the field.

d) The level of paramagnetic liquid in U-tube is rises when subjected to magnetic field.

 

(iii) Ferromagnetic Substances e.g. Iron, Nickel, Cobalt

Properties:

a)Ferromagnetic materials show the properties of the paramagnetic materials to a higher or     greater degree.

b)The value of permeability and susceptibility is very high.