Question

Write two characteristics of a material used for making permanent magnets ?

Answer 1

The material used for making permanent magnets should have the following characteristics:

(a) High retentivity: It ensures that the magnet remains strong even after removal of the magnetising field.

(b) High coercivity: It ensures that the magnetism of the material does not get easily lost.

Apart from these two criteria, the material should have high permeability.