Which of the following property of magnetic materials is observed in all the materials?

1. Ferromagnetism

2. Paramagnetism

3. Diamagnetism

4. Electromagnetism

Two small bar magnets are placed in a plane. The direction of their dipole moments and the position of magnets are as shown in the figure.

The appropriate direction of the net magnetic field at point 'P' will be indicated by which of the following arrow?

If H is the horizontal component of the earth's magnetic field and 'V' is the vertical component of the earth's magnetic field, then at the magnetic equator:

1. V and H are equal.

2. values of V and H are zero.

3. value of H is zero only.

4. value of V is zero only.

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 force between two magnetic poles of strength unity at a separation of 1 m is:

$1. 1 N$
$2. \frac{{10}^{-7}}{4\mathrm{\pi }}$
$3. {10}^{-7 }N$
$4. 4\mathrm{\pi } \times {10}^{-7 }\mathrm{m}$

The magnetic lines of force inside a bar magnet are:

The material which is used to make permanent magnet has:

On a magnetic map, the lines joining the points of the same value of the horizontal component of the earth's magnetic field are called :

1. Aclinic lines

2. Isoclinic lines

3. Isodynamic lines

4. Isogonic lines

What is the unit of pole strength of a bar magnet?

1. ampere-metre

2. ampere/metre

3. ampere/metre²

4. ampere-metre²

The ratio of magnetic length and geometrical length of a bar magnet is about :

1. 0.84

2. 0.42

3. 0.21

4. 1