To protect an instrument from an external magnetic field,it is completely surrounded by:

$A$ sample of paramagnetic salt contains $2.0 \times 10^{24}$ atomic dipoles each of dipole moment $1.5 \times 10^{-23} \; J \, T^{-1}$. The sample is placed under a homogeneous magnetic field of $0.64 \; T$ and cooled to a temperature of $4.2 \; K$. The degree of magnetic saturation achieved is $15 \%$. What is the total dipole moment of the sample for a magnetic field of $0.98 \; T$ and a temperature of $2.8 \; K$? (Assume Curie's law)

Which one of the following is a non-magnetic substance?

The meniscus of a liquid contained in one of the limbs of a $U-$tube is placed between the poles of an electromagnet with the meniscus in line with the field. The liquid is seen to rise in the limb by a small amount. This indicates that the liquid is:

In some ferromagnetic materials,magnetization disappears on the removal of the external magnetic field. Such materials are called:

Identify the incorrect statement from the following.