The soft-iron is a suitable material for making an electromagnet. This is because soft-iron has

Curie temperature is the temperature above which

$A$ 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)

Explain diamagnetism and diamagnetic substances.

The phenomenon of perfect diamagnetism in superconductors is called the . . . . . . .

Which of the following is desirable for making permanent magnets?