Magnetism and Matter Class 12 Notes will help you in your Exam Preparation and will also help in scoring good! The property of any object by virtue of which it can attract a piece of iron or steel is called magnetism. Here will study about the Atomic Theory of Magnetism.
Atomic Theory of Magnetism :
(1) Each atom behaves like a complete magnet having a north and south pole of equal strength. The electrons revolving around the nucleus in an atom are equivalent to small current loops which behaves as magnetic dipole.
(2) In unmagnetized magnetic substance these atomic magnets (represented by arrows) are randomly oriented and form closed chains. The atomic magnets cancel the effect of each other and thus resultant magnetism is zero.
- 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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