The magnetic property of a magnetic substance is associated with

Ferromagnetic materials have . . . . . . permeability and . . . . . . retentivity.

Name the suitable material for an electromagnet.

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

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:

One of the following substances having the tendency to move from a stronger region to a weaker region of the magnetic field is: