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. \(\frac{B}{\mu_0H}\)
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 \((10 ~\text{cm}\times 4~\text{cm}\times1~\text{cm})\) is \(4 ~\text{Am}^2\). Its intensity of magnetisation is:
1. \(10^{3}\) A/m
2. \(10^{2}\) A/m
3. \(10^{5}\) A/m
4. \(10^{4}\) A/m

S.I. unit of intensity of magnetization is:

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

A compass needle which is allowed to move in a horizontal plane is taken to a geomagnetic pole. It will:

1. stay in the east-west direction only.

2. stay in any position.

3. become rigid showing no movement.

4. stay in the north-south direction only.

The possible value of magnetic susceptibility of a diamagnetic material can be:

1. \(-2.45\)

2. \(0.75\)

3. \(-0.5\)

4. \(1.67\)