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 $B-H$ curves $S_1$ and $S_2$ in the adjoining figure are associated with:

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:

The study of the hysteresis curve for a given material is used to estimate the:

The $B-H$ curve for a ferromagnet is shown in the figure. The ferromagnet is placed inside a long solenoid with $1000 \text{ turns/cm}$. The current that should be passed in the solenoid to demagnetize the ferromagnet completely is

The only property possessed by ferromagnetic substances is