MODEL QUESTIONS

A hypothetical bar magnet $\left(AB\right)$ is cut into two equal parts. One part is kept over the other, so that pole $C_2$ is above $C_1$. If $M$ is the magnetic moment of the original magnet, what would be the magnetic moment of the combination, so formed?

Define magnetic intensity at a point in a magnetic field. Deduce an expression for the magnetic field intensity at a point in the end-on-position due to bar magnet.

What do you mean by end-on and broad-side on position of a bar magnet? Deduce an expression for the magnetic intensity at a point in the broad-side-on position due to a bar magnet.

Show that magnetic field intensity in the end-on-position due to a short bar magnet is twice the intensity in the broad-on-position at the same distance from the same magnet.

Define the terms: magnetic intensity, magnetic induction, the intensity of magnetization, permeability, and susceptibility of a magnetic substance. How they are related to each other.

What do you mean by dia, para and ferromagnetic substance? Give two examples in each case.

What do you mean by diamagnetic substance? Show that it is the universal effect? Discuss properties of diamagnetic substance?

Correct the statement:

In the relation $\mathrm{B}=\mathrm{\mu H}$ ,$\mu$ is called permitivity.