The magnetic susceptibility of a paramagnetic substance at $-173^{\circ} C$ is $1.5 \times 10^{-2}$. To have the susceptibility $0.5 \times 10^{-2}$,the change in temperature in ${ }^{\circ} C$ is

The meniscus of a liquid contained in one of the limbs of a $U-$tube is placed between the poles of an electromagnet with the meniscus in line with the field. The liquid is seen to rise in the limb by a small amount. This indicates that the liquid is:

Nickel shows ferromagnetic property at room temperature. If the temperature is increased beyond Curie temperature,then it will show

Assertion: $A$ paramagnetic sample displays greater magnetisation (for the same magnetic field) when cooled.
Reason: The magnetisation does not depend on temperature.

The Curie temperatures of cobalt and iron are $1400 \,K$ and $1000 \,K$ respectively. At $T=1600 \,K$, the ratio of the magnetic susceptibility of cobalt to that of iron is

The relative permeability $(\mu_r)$ of a ferromagnetic substance varies with temperature $(T)$ according to the curve shown in the figure.