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

Question

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Answer 1

Hysteresis: The phenomenon in which the magnetic induction ( $B$ ) lags behind with respect to the magnetizing field $H$ is called hysteresis.
It occurs when an external magnetic field is applied to a ferromagnet such as iron and the atomic dipoles align themselves with it. Even when the field is removed, part of the alignment will be retained: the material has become magnetized. Once magnetized, the magnet will stay magnetized indefinitely.

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 its coercivity.

Answer 2

Hysteresis: The phenomenon in which the magnetic induction (

B

) lags behind with respect to the magnetizing field

H

is called hysteresis.

It occurs when an external magnetic field is applied to a ferromagnet such as iron and the atomic dipoles align themselves with it. Even when the field is removed, part of the alignment will be retained: the material has become magnetized. Once magnetized, the magnet will stay magnetized indefinitely.

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 its coercivity.

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

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The figure gives experimentally measured B vs. H variation in a ferromagnetic material. The retentivity, co-ercivity and saturation, respectively, of the material are :

Define retentivity.

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What do you mean by magnetic hysteresis curve ? Draw hysteresis curve and define terms related to it.

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