Electrical Engineering ⇒ Topic : Magnetic Materials
We can classify materials into three categories viz. diamagnetic, paramagnetic and ferromagnetic.
The behaviour of these three classes of substances is different in an external magnetic field.
(1) When a diamagnetic substance (e.g. copper, zinc, bismuth etc.) is placed in a magnetic field, the substance iffeebly magnetised in a direction opposite to that of the applied field. Therefore, a diamagnetic substance is feebly repelled by a strong magnet.
(2) When a paramagnetic substance (e.g. aluminium, antimony etc.) is placed in a magnetic field, the substance is feebly magnetised in the direction of the applied field. Therefore, a paramagnetic substance is feebly attracted by a strong magnet.
(3) When a ferromagnetic substance (e.g. iron, nickel, cobalt etc.) is placed in a magnetic field, the substance is strongly magnetised in the direction of the applied field. Therefore, a fen-omagnetic substance is strongly attracted by a magnet.
Note that diamagnetism and paramagnetism are weak forms of magnetism. However, fen-omagnetic substances exhibit very strong magnetic effects.
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