The correct measure of magnetic hardness of a material is,

permanent magnetism

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Hysteresis loss

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Coercivity

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retentivity

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Solution

The correct option is C Coercivity
Coercivity is the resistance of a magnetic material to changes in its magnetization.

It is equivalent to the field intensity necessary to demagnetize the fully magnetized material.

Therefore, coercivity is the correct measure of magnetic hardness of a material.

Hence, option $(C)$ is the correct answer.

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Similar questions

Select the correct option:

I) A magnetic needle responds to the Earth’s magnetic field.

II) A magnetic needle gets deflected when a magnet is brought near it.

III) A magnetic needle is made up of a non-magnetic material.

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