At Curie point,a ferromagnetic material becomes

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?

Materials suitable for permanent magnets must have which of the following properties?

The magnetic susceptibility $\chi$ for superconductors 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.

Assertion: $A$ paramagnetic sample displays greater magnetisation (for the same magnetic field) when cooled.
Reason: The magnetisation does not depend on temperature.