There are four light-weight-rod samples; A, B, C, D separately suspended by threads. A bar magnet is slowly brought near each sample and the following observations are noted:

i.	A is feebly repelled
ii.	B is feebly attracted
iii.	C is strongly attracted
iv.	D remains unaffected

Which one of the following is true?

1.	C is of a diamagnetic material
2.	D is of a ferromagnetic material
3.	A is of a non-magnetic material
4.	B is of a paramagnetic material

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

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: