In the hysteresis cycle,the value of $H$ needed to make the intensity of magnetisation zero is called

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

The area of the hysteresis loop of a material is equivalent to $250 \, J$. When $10 \, kg$ of the material is magnetized by an alternating field of $50 \, Hz$, what is the energy lost in one hour? (Given: density of the material is $7.5 \, g/cm^3$)

The coercivity of a small magnet where the ferromagnet gets demagnetized is $3 \times 10^3 \ Am^{-1}$. The current required to be passed in a solenoid of length $10 \ cm$ and number of turns $100$,so that the magnet gets demagnetized when inside the solenoid,is:

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