Single Choice

The figure illustrate how $$ B $$, the flux density inside a sample of unmagnetised ferromagnetic material varies with $$ B_0 $$ , the magnetic flux density in which the sample is kept. For the sample to be suitable for making a permanent magnet

A$$ OQ $$ should be large, OR should be small
B$$ OQ $$ and OR should both be large
Correct Answer
C$$ OQ $$ should be small and OR should be large
D$$ OQ $$ and OR should both be small

Solution

In the given figure $$ OQ $$ refers to retentivity while $$ OR $$ refers to corecivity, for permanents both retentivity and corecivity should be high.

SIMILAR QUESTIONS

Magnetism

Which of the following statement related to hysteresis loop is incorrect?

Magnetism

When a ferromagnetic material goes through a hysteresis loop, the magnetic susceptibility.

Magnetism

Write two properties of a material suitable for making (a) a permanent magnet, and (b) an electromagnet.

Magnetism

Point out the wrong statement about the magnetic properties of soft iron and steel

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