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 x2 on equatorial position?

1. 9 gauss

2. 4 gauss

3. 36 gauss

4. 4.5 gauss

Subtopic:  Bar Magnet |
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The possible value of magnetic susceptibility of a diamagnetic material can be:

1. -2.45

2. 0.75

3. -0.5

4. 1.67

Subtopic:  Magnetic Materials |
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The bar magnet A of magnetic moment MA is found to oscillate at a frequency twice that of magnet B of magnetic moment MB and the same moment of inertia when placed in a vibration magnetometer. We may say that:

1. MB = 8MA

2. MA = 4MB

3. MA = 8MB

4. MA = 2MB

Subtopic:  Analogy between Electrostatics & Magnetostatics |
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When a magnetic material is subjected to a very small magnetising force H, the intensity of magnetisation is proportional to:

1. 1H

2. H

3. H

4. H2

Subtopic:  Magnetization & Magnetic Intensity |
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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

Subtopic:  Earth's Magnetism |
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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

Subtopic:  Magnetization & Magnetic Intensity |
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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.

Subtopic:  Bar Magnet |
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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

Subtopic:  Curie's Law and Hysteresis |
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As we go from the magnetic equator towards the geographic south pole, the angle of the dip will become:

1. More and more vertically downward and perpendicular to the surface at the magnetic pole.
2. More and more vertically upward and perpendicular to the surface at the magnetic pole.
3. Less and less vertically downward and horizontal at the magnetic pole.
4. Less and less vertically upward and horizontal at the magnetic pole.
Subtopic:  Earth's Magnetism |
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A long solenoid has 1500 turns per metre and an iron core of μr = 1100 is kept inside it. 2A current flows in the coil of the solenoid. If the core is heated beyond curie temperature then:

1. the H and B fields in the solenoid reduce to zero.
2. the H and B fields in the solenoid remain unchanged.
3. the H field in the solenoid is nearly unchanged but B field decreases significantly.
4. the B field in the solenoid is nearly unchanged but the H field decreases significantly.
Subtopic:  Curie's Law and Hysteresis |
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