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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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Retentivity: The property of a ferromagnetic substance to retains magnetism even after the magnetic intensity is made zero
Coercivity: The property that the specimen required a reverse field to demagnetize completely is called coercivity.
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