$A$ sensitive magnetic instrument can be shielded very effectively from outside magnetic fields by placing it inside a box of

The magnetic susceptibility $\chi$ for superconductors is . . . . . . .

The Curie-Weiss law is obeyed by iron at a temperature ......

$A$ substance is placed in a non-uniform magnetic field. It experiences a weak force towards the strong field. The substance is . . . . . . type.

$A$ sample of paramagnetic salt contains $2 \times 10^{24}$ atomic dipoles each of dipole moment $1.5 \times 10^{-23} \text{ J T}^{-1}$. The sample is placed under a homogeneous magnetic field of $0.6 \text{ T}$ and cooled to a temperature of $4.2 \text{ K}$. The degree of magnetic saturation achieved is $20 \%$. What is the total dipole moment of the sample for a magnetic field of $0.9 \text{ T}$ and a temperature of $2.8 \text{ K}$ (in $\text{ J T}^{-1}$)?

Diamagnetic substances are