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

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

A substance is placed in an external magnetic field. If the direction of induced dipole moment is opposite to the direction of the applied magnetic field, then the substance may be

1. Paramagnetic

2. Diamagnetic

3. Ferromagnetic

4. Both (1) & (3)