$A$ small bar of ferromagnetic substance is placed in a non-uniform magnetic field. In which direction does it move?

One of the following substances having the tendency to move from a stronger region to a weaker region of the magnetic field is:

What is a ferromagnetic substance? What is a magnetic domain?

The magnetic susceptibility of a paramagnetic material is $1.0 \times 10^{-5}$ at $27^{\circ} C$ temperature. Then at what temperature its magnetic susceptibility would be $1.5 \times 10^{-5}$ (in $^{\circ} C$)?

What are permanent magnets? Give the ways for preparing them.

$A$ paramagnetic sample shows a net magnetisation of $8 \text{ Am}^{-1}$ when placed in an external magnetic field of $0.6 \text{ T}$ at a temperature of $4 \text{ K}$. When the same sample is placed in an external magnetic field of $0.2 \text{ T}$ at a temperature of $16 \text{ K}$,the magnetisation will be