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 lines of force inside a bar magnet are:

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)

If B_o is magnetic flux density in vacuum produced by a magnetising force and magnetic flux density produced by the magnetisation of a material due to the same magnetising force is B_m, then the total magnetic flux density in the material is :

$1.<mspace\; width="1em"></mspace>B_{\circ }+<mspace\; width="1em"></mspace>B_m$
$2.<mspace\; width="1em"></mspace>B_{\circ }-<mspace\; width="1em"></mspace>B_m$
$3.<mspace\; width="1em"></mspace>\frac{B_{\circ }}{B_m}$
$4.<mspace\; width="1em"></mspace>\frac{B_m}{B_{\circ }}$
$$

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 of a substance is -0.0002 at room temperature. If this substance is kept in a uniform external magnetic field B, the net field inside the substance becomes B', then :

1. B'$>$B

2. B'$<$B

3. B' = B

4. B' = 0

The magnetic moment of a short dipole is \(100\) A-m². The magnetic induction in vacuum at \(1\) m from the dipole on the axis of the dipole is:

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. \(10^{3}~\text{A/m}\)
2. \(10^{2}~\text{A/m}\)
3. \(10^{5}~\text{A/m}\)
4. \(10^{4}~\text{A/m}\)