Question

Define the term magnetic permeability of a magnetic material. Write any two

characteristics of a magnetic substance if it is to be used to make a

permanent magnet. Give an example of such a material.



Answer .........
The material used for making a permanent magnet should possess high value of coercivity and also a resonable value of the retentivity. Moreover, the area of hysteresis curve should also be large. A permanent magnet is never taken through a complete cycle of magnetisation and hence the large area of hysteresis curve will not be a demerit of such a material. Steel and alnico fulfil all these requirements.

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Answer 1

Answer:

the answer is correct