The magnetic susceptibility is negative for

Explain the behavior of a superconductor as a diamagnetic material.

What is the magnetic susceptibility of a superconductor?

Which of the following statements are correct?
$(A)$ Electric monopoles do not exist whereas magnetic monopoles exist.
$(B)$ Magnetic field lines due to a solenoid at its ends and outside cannot be completely straight and confined.
$(C)$ Magnetic field lines are completely confined within a toroid.
$(D)$ Magnetic field lines inside a bar magnet are not parallel.
$(E)$ $\chi = -1$ is the condition for a perfect diamagnetic material,where $\chi$ is its magnetic susceptibility.
Choose the correct answer from the options given below:

At a temperature of $30\,^{\circ}\text{C}$,the susceptibility of a ferromagnetic material is found to be $\chi$. Its susceptibility at $333\,^{\circ}\text{C}$ is......$\chi$.

The materials suitable for making electromagnets should have