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


Best Answer

Explanation

Hysteresis is the phenomenon when the magnetic induction (B ) lags behind the magnetizing field.(H) is observed as hysteresis.

coercivity' and 'retentivity

When a ferromagnetic material, like iron, is exposed to an external force field, the atomic dipoles align themselves with it.

a part of the alignment is going to be kept whether or not the sphere is removed: the substance has become magnetic.

The material will remain magnetized eternally once it's been magnetized.

Retentivity, also referred to as remanence, is the ability of a magnetic substance to retain magnetism within the absence of a magnetizing force.

Coercivity, The magnetizing field (H) required to totally demagnetize the magnetic material .

 

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