In the hysteresis curve,the value of magnetic induction $(B)$ which remains in a substance when the value of the magnetizing force $(H)$ is made zero $(H=0)$ is called

The only property possessed by ferromagnetic substances is

The figure illustrates how $B$,the flux density inside a sample of unmagnetised ferromagnetic material,varies with $B_0$,the magnetic flux density in which the sample is kept. For the sample to be suitable for making a permanent magnet:

Draw the hysteresis curve ($B-H$ loop) and explain it.

The figure illustrates how $B$,the flux density,inside a sample of ferromagnetic material varies with external magnetic field $B_0$. For the sample to be suitable for making a permanent magnet,

The intensity of magnetisation $I$ is plotted against the magnetising field $H$ for different substances. The curves $A$ and $B$ shown in the adjoining figure are associated with