Assertion: Ferromagnetic substances become paramagnetic above the Curie temperature.
Reason: Domains are destroyed at high temperature.

The magnetic moment of a diamagnetic atom is

Relative permittivity and permeability of a material are $\varepsilon_r$ and $\mu_r$ respectively. Which of the following values of these quantities are allowed for a diamagnetic material?

Give some examples:
$(i)$ Ferromagnetic substances.
$(ii)$ Paramagnetic substances.

If a diamagnetic substance is brought near the north or south pole of a bar magnet,it is:

$A$ 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)