The magnetic lines of force inside a bar magnet are:

1.	from south to the north pole.
2.	from north to the south pole.
3.	not present.
4.	intersecting each other.

The material which is used to make permanent magnet has:

An electric cable is carrying current from north to south. The position of the null point from the cable is:

1. Vertically upward

2. Vertically downward

3. Eastward

4. Nowhere

Which of the following graphs represents the correct variation of the intensity of magnetisation (I) with the intensity of the magnetising field (H) in a ferromagnetic substance?

1.		2.
3.		4.

The magnetic susceptibility χ of a ferromagnetic material varies with temperature, as:

1.		2.
3.		4.

Which of the following is not dimensionless?
(where symbols stand for their usual meanings in magnetism)

1. $\frac{I}{H}$

2. $\frac{B}{{\mu }_{0}H}$

3. ${\mu }_r$

4. $\frac{{\mu }_{r}B}{H}$

At a place, the angle of dip is 30$°$. If the horizontal component of the earth's magnetic field is B, the total intensity is:

1. $\frac{\sqrt{3}B}{2}$

2. $\frac{2B}{\sqrt{3}}$

3. 2B

4. B$\sqrt{3}$

The magnetic moment of a magnet \((10 ~cm\times 4~cm\times1~cm)\) is \(4 ~Am^2\). Its intensity of magnetisation is:

1. 10³ A/m

2. 10² A/m

3. 10⁵ A/m

4. 10⁴ A/m

S.I. unit of intensity of magnetization is:

A ferromagnetic material is placed in an external magnetic field. The magnetic domains: