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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 value of magnetic filed B when magnetic intensity H=0 is called retentivity .
The value of magnetic intensity H when magnetic field B=0 Is called coercivity .
Detailed Answer:
Retentivity:The ability of a substance to retain magnetization after removal of the inducing magnetic field.
Coercivity:Ciercivity is defined as the ability of a ferromagnetic material to withstand an external magnetic field without becoming demagnetized.
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