Physics - Magnetism Question with Solution | TestHub

The curve of $\mathrm{B}$ against $\mathrm{H}$ for $\mathrm{a}$ ferromagnetic material is called hysteresis loop

The area of $B$ - $H$ curve is a measure of power dissipated per cycle per unit area of the specimen

Coercitivity is a measure of the magnetic field required to destroy the residual magnetism of ferromagnetic material

The retentivity of a specimen is the measure of magnetic field remaining in the specimen when the magnetising field is removed