1.

What is hysteresis? Define the terms ‘coercivity’ and ‘retentivity’ of a ferro magnetic material.

Answer»

Hysteresis: The phenomenon of lagging behind the magnetic induction (\(\vec B\)) with respect to the magnetizing field (\(\vec h\)) is called hysteresis.

Retentivity: The property of the magnetic material to retain magnetism even in the absence of the magnetizing field is known as retentivity or remanence.

Coercivity: The magnetizing field (H) needed to demagnetize the magnetic material completely is known as coercivity.



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