If the magnetic field of the earth at any point on the magnetic equator is 0.4×10-4 T, then the value of the magnetic field at the magnetic pole of the earth is approximately

1. 0.4×10-4 T

2. 0.2×10-4 T

3. 0.8×10-4 T

4. 0.3×10-4 T

Subtopic:  Earth's Magnetism (OLD NCERT) |
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S.I. unit of intensity of magnetization is:

1. Ampere-metre 2. Ampere-metre2
3. Ampere/metre 4. Ampere/metre2
Subtopic:  Magnetization & Magnetic Intensity |
 62%
From NCERT
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When the plane of a dip circle is along the magnetic meridian, the period of oscillations of dip needle is T1. When the plane of dip circle is perpendicular to the magnetic meridian, the period of oscillations is T2, then T1/T2 is (Angle of dip = 30°)

1. 2

2. 1

3. 2

4. 12

Subtopic:  Earth's Magnetism (OLD NCERT) |
 53%
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A ferromagnetic material is placed in an external magnetic field. The magnetic domains:

1. must increase in size.
2. must decrease in size.
3. may increase or decrease in size.
4. disappear.

Subtopic:  Magnetic Materials |
From NCERT
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Magnetic permeability is maximum for

1. Diamagnetic substance

2. Paramagnetic substance

3. Ferromagnetic substance

4. Same for all three substances

Subtopic:  Magnetic Materials |
 86%
From NCERT
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The area enclosed by hysteresis loop is a measure of :

1. Permeability

2. Susceptibility

3. Retentivity

4. Energy loss per cycle

Subtopic:  Curie's Law and Hysteresis (OLD NCERT) |
 75%
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Susceptibility of a substance at 300 K is -0.00002. Its susceptibility at 600K is

1. -0.00001

2. -0.00004

3. -0.00006

4. -0.00002

Subtopic:  Magnetic Materials |
 53%
From NCERT
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Line joining places of zero angle of dip on earth surface is called :

1. Isoclinic line

2. Aclinic line

3. Isogonic line

4. Agonic line

Subtopic:  Earth's Magnetism (OLD NCERT) |
 59%
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When a dip circle is kept at a place, the angle of dip obtained is 45°. When the dip circle is rotated about its vertical axis by 90°, the angle of dip obtained is 60°. The true dip at that place is :

1. cot-1 23

2. cot-143

3. tan-123

4. tan-143

Subtopic:  Earth's Magnetism (OLD NCERT) |
 55%
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The magnetic moment of a bar magnet shown in figure(i) is M.

If a hole is drilled through the magnet as shown in figure(ii), then the new magnetic moment of the magnet will be :

1. Equal to M

2. Less than M

3. More than M

4. Zero

Subtopic:  Bar Magnet |
 56%
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