- In magnetised substance all the atomic magnets are aligned in same direction and thus resultant magnetism is non-zero.
The atomic theory explains the following facts in magnetism.
(1) Non existence of monopoles. The magnetic poles always exist in pairs and are of equal strength.
(2) When a magnet breaks than each part behaves like a complete magnet.
(3) Magnetisation of an electromagnet can be explained as alignment of atomic magnets in direction of magnetic field.
(4) This explains the phenomenon of saturation magnetization i.e. acquired magnetism remains constant even on increasing the external magnetizing field.
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