Due to a small magnet, the intensity at a distance x in the end-on position is 9 gauss. What will be the intensity at a distance $\frac{x}{2}$ on equatorial position?

1. 9 gauss

2. 4 gauss

3. 36 gauss

4. 4.5 gauss

The possible value of magnetic susceptibility of a diamagnetic material can be:

1. -2.45

2. 0.75

3. -0.5

4. 1.67

The bar magnet A of magnetic moment M_A is found to oscillate at a frequency twice that of magnet B of magnetic moment M_B and the same moment of inertia when placed in a vibration magnetometer. We may say that:

1. M_B = 8M_A

2. M_A = 4M_B

3. M_A = 8M_B

4. M_A = 2M_B

When a magnetic material is subjected to a very small magnetising force H, the intensity of magnetisation is proportional to:

1. $\frac{1}{\sqrt{H}}$

2. $\sqrt{H}$

3. H

4. H²

If a bar magnet is kept on a horizontal plane with N-pole of bar magnet facing geographic N-pole and S-pole of bar magnet facing geographic S-pole, then the number of neutral points is:

1. 0

2. 1 

3. 2

4. Infinite

The magnetization of a piece of iron or steel:

1. depends on the strength of the magnetizing field.

2. depends on external conditions such as temperature.

3. cannot be done beyond the saturation point.

4. All of these

A Gaussian surface is drawn enclosing the N-pole of a bar magnet. The net magnetic flux through the Gaussian surface will be:
(pole strength of N-pole is treated as positive and S-pole as negative)

1. positive.

2. negative.

3. positive or negative.

4. zero.

A material when heated suddenly changes its magnetic property at a particular temperature and above this temperature, its susceptibility is found to be inversely proportional to the absolute temperature. The material may be:

1. Ferromagnetic

2. Diamagnetic

3. Paramagnetic

4. Ferromagnetic or Paramagnetic

As we go from the magnetic equator towards the geographic south pole, the angle of the dip will become:

A long solenoid has 1500 turns per metre and an iron core of ${\mu }_r$ = 1100 is kept inside it. 2A current flows in the coil of the solenoid. If the core is heated beyond curie temperature then: