In a ferromagnetic material,below the Curie temperature,a domain is defined as:

The materials suitable for making electromagnets should have

The variation of intensity of magnetisation $(I)$ and the applied magnetic field intensity $(H)$ for three magnetic materials $X$,$Y$ and $Z$ are shown in the graph as $OX$,$OY$ and $OZ$ respectively. The materials $X$,$Y$ and $Z$ respectively are:

Curie temperature is the temperature above which

Choose the $CORRECT$ variation of $\mu$ (permeability of material) with magnetising field intensity $(H)$ for a ferromagnetic material.

Consider the following statements regarding paramagnetic substances:
$A$. They are weakly attracted by an external magnetic field.
$B$. They are strongly attracted by an external magnetic field.
$C$. Their magnetic susceptibility $(\chi)$ is small and positive.
$D$. In a non-uniform magnetic field, they move from a region of strong magnetic field to a region of weak magnetic field.
Which of the above statements are correct?