Magnetic susceptibility of a paramagnetic substance is

Which of the following is desirable for making permanent magnets?

The variation of the intensity of magnetisation $(I)$ with respect to the magnetising field $(H)$ in a diamagnetic substance is described by the graph

What type of materials can be used to make an electromagnet?

$A$ 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

The materials suitable for making electromagnets should have