If the given figure shows the relation between magnetic field ($B$ - along $y$-axis) and magnetic intensity ($H$ - along $x$-axis) of a ferromagnetic material,then the point that represents the coercivity of the material is

The coercivity of a magnet is $5 \times 10^3 \text{ A/m}$. The amount of current required to be passed in a solenoid of length $30 \text{ cm}$ and the number of turns $150$,so that the magnet gets demagnetized when placed inside the solenoid is ............. $A$.

Magnetic hysteresis is exhibited by . . . . . . magnetic materials.

$A$ ferromagnetic material of volume $10^{-3} \, m^3$ is subjected to a magnetic field with a frequency of $50 \, Hz$. The area of the hysteresis loop is $0.1 \, M.K.S. \, \text{units}$. Calculate the energy dissipated in $1 \, \text{sec}$.

The coercivity of a small magnet is $4 \times 10^3 \ A/m$. It is placed inside a solenoid of length $1 \ m$ having $500$ turns to demagnetize it. The current that must be passed through the solenoid is .......... $A$.

The area of the hysteresis loop of a substance indicates: