The magnetic susceptibility of ferromagnetic materials is

Consider the following two statements $A$ and $B$ and identify the correct choice in the given answers.
$A$. Paramagnetism is explained by domain theory.
$B$. Susceptibility of a diamagnetic substance is independent of temperature.

$A$ ball of superconducting material is dipped in liquid nitrogen and placed near a bar magnet.
$(i)$ In which direction will it move?
$(ii)$ What will be the direction of its magnetic moment?

$A$ superconductor exhibits perfect

$A$ ferromagnetic material is heated above its $Curie$ temperature. The correct statement from the following is that

Which of the following is desirable for making permanent magnets?