General properties of Diamagnetic Material
The materials which have net magnetic moments i.e., those materials which reveal para and ferromagnetism, the diamagnetism in those materials becomes overshadowed due to its weak value. So, Diamagnetism is a quantum mechanical effect that occurs in all materials; when it is the only contribution to the magnetism, the material is called diamagnetic.
In short, it can be said that that material which, when placed in a magnetic field acquire a small amount of magnetism opposite to the direction of the inducing magnetic field are called diamagnetic materials. Examples – copper, silver, zinc, bismuth, lead, glass, marble, helium, water, argon, sodium chloride etc.
(i) Diamagnetic materials tend to move from a strong intensity to a weaker region in a non-uniform magnetic field. That means there are feebly repelled by the magnetic field.
(ii) When a diamagnetic material is placed in a magnetic field, the lines of force tend to move away from the material. As a result, a number of lines of force passing through the material become less [Figure].
(iii) Magnetic induction B of a diamagnetic material is slightly less than the magnetic field intensity H.
(iv) The value of magnetic susceptibility is very small.
(v) Susceptibility of a diamagnetic material does not depend on the applied magnetic field and temperature.