The magnet can be completely demagnetized by

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,

$A$ bar magnet has a coercivity of $4 \times 10^3 \text{ A m}^{-1}$. It is placed inside a solenoid of $12 \text{ cm}$ length and $60$ turns. The current that should be passed through the solenoid to demagnetize the bar magnet is: (in $\text{ A}$)

In the following graph of flux density $(B)$ versus magnetizing force $(H)$,coercivity and retentivity are respectively represented by the points

Magnetic materials used for making permanent magnets $(P)$ and magnets in a transformer core $(T)$ have different properties. Of the following, which property best matches the type of magnet required?

The only property possessed by ferromagnetic substances is