Question

Write a short note on the theory of magnetism.

Answer 1

Hint:Theory of magnetism is given by a scientist Weber, and hence it is also called as Weber’s theory. From the concept of this theory, we can say that all the substances having properties of the magnet are made up of smaller magnets present in a large number.

Complete step by step answer:
-The molecules of the un-magnetized body have magnet properties, and due to which magnetic forces arise, these magnetic forces are made neutral by the neighbouring molecules because it also has magnetic force but not in the same direction as that of its adjacent molecule as a result of which there is no magnetic effect present. Whereas in a magnetized body the directions of tiny magnets are in such a way that all the tiny magnets are headed towards the north pole, and the other direction is called the south pole which faces another side of the magnetic molecules.
-If the material is ferromagnetic, then it will act as a permanent magnet if it is placed in a magnetic field for a particular time because its molecules are aligned in the direction of magnetic field permanently and do not change ever after it is removed from the magnet.
Therefore, based on the above explanation, we can say that a magnetic material must have a north pole and a south pole.

Note: We can note that both magnetized and unmagnetized material has small magnetic molecules, but due to their alignment and resultant of magnetic force, their magnetic property as a whole is defined.