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What is hysterisis? Define the terms 'co...

What is hysterisis? Define the terms 'coercivity' and 'retentivity' of a ferromagnetic material.

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The phenomenon of lagging of magnetic flux density or induction behind the magnetising field is known as hysteresis.
The property of a material to retain the magnetism even after the removal of the magnetising field is known as retentivity .
Coercivity refers to the property of a material which shows the tendency of opposition to the removal of residual magnetism in the material .
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