If $\chi_1$,$\chi_2$,and $\chi_3$ are the magnetic susceptibilities of a paramagnetic material at temperatures $T_1 \ K$,$T_2 \ K$,and $T_3 \ K$ respectively,then which of the following relations is correct?

The materials suitable for making electromagnets should have

$A$ sample of paramagnetic salt contains $2 \times 10^{24}$ atomic dipoles each of dipole moment $1.5 \times 10^{-23} \text{ J T}^{-1}$. The sample is placed under a homogeneous magnetic field of $0.6 \text{ T}$ and cooled to a temperature of $4.2 \text{ K}$. The degree of magnetic saturation achieved is $20 \%$. What is the total dipole moment of the sample for a magnetic field of $0.9 \text{ T}$ and a temperature of $2.8 \text{ K}$ (in $\text{ J T}^{-1}$)?

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:

Suppose a small cylinder of a paramagnetic substance and a small cylinder of a diamagnetic substance are placed between the (parallel) pole pieces of a strong magnet,so that they are aligned along the direction of the field lines. Will they attract or repel each other?

Give some examples:
$(i)$ Ferromagnetic substances.
$(ii)$ Paramagnetic substances.