For substances,hysteresis $(B-H)$ curves are given as shown in the figures. Which of the following is best for making a temporary magnet?

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

If the $B-H$ curves of two samples $P$ and $Q$ of iron are as shown below,then which one of the following statements is correct?

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:

$A$ bar magnet is demagnetized by inserting it inside a solenoid of length $0.2 \, m$,$100 \, turns$,and carrying a current of $5.2 \, A$. The coercivity of the bar magnet is.....$A/m$

The magnet can be completely demagnetized by