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

1.	repelled by both the poles
2.	repelled by the north pole and attracted by the south pole
3.	attracted by the north pole and repelled by the south pole
4.	attracted by both the poles

The magnetic dipoles in a diamagnetic material are represented, for three situations. The three situations differ in magnitude if a magnetic field is applied to the material. In which situation the magnetization of the material is the greatest:

    
1. A

2. B

3. C

4. equal in A, B, and C

Two bar magnets are held together tightly in a vibration magnetometer. When their like poles are together, they make 20 oscillations per minute and when their unlike poles are together, they make 8 oscillations per minute. The ratio of the magnetic dipole moments of two bar magnets is:

1. 29:21

2. 6:15

3. 1:6

4. 25:4

The magnetic susceptibility $\chi$ of a diamagnetic material depends on absolute temperature T as:

$1.$ $\chi$ $\propto$ $$ $T$ $$
$2.$ $\chi$ $\propto$ $\frac{1}{T}$
$3.$ $\chi$ $\propto$ $$ $T^0$ $$
$4.$ $\chi$ $\propto$ $\frac{1}{\sqrt{T}}$

The magnetic lines of force inside a bar magnet are:

The material which is used to make permanent magnet has:

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. $\frac{{\mu }_{r}B}{H}$

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: