# Which one of the following is correct? 1. The magnetic field lines also represent the lines of force on a moving charged particle at every point. 2. Magnetic field lines can be entirely confined within the core of a toroid, but not within a straight solenoid. 3. A bar magnet exerts a torque on itself due to its own field. 4. Magnetic field arises due to stationary charges.

Subtopic:  Magnetic Field & Field Lines |
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Which of the following is the correct representation of magnetic field lines?

1. (g), (c)

2. (d), (f)

3. (a), (b)

4. (c), (e)

Subtopic:  Magnetic Field & Field Lines |
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Diamagnetic material in a magnetic field moves:

1. from stronger to the weaker parts of the field

2. from weaker to the stronger parts of the field

3. perpendicular to the field

4. in none of the above directions

Subtopic:  Magnetic Materials |
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According to Curie's law, the magnetic susceptibility of a substance at an absolute temperature T is proportional to:

1. 1/T

2. T

3. 1/T2

4. T2

Subtopic:  Curie's Law and Hysteresis |
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If the magnetic dipole moment of an atom of diamagnetic material, paramagnetic material and ferromagnetic material are denoted by µd, µp, and µf respectively, then:

1. µp = 0 and µf ≠ 0

2. µd ≠ 0 and µp = 0

3. µd ≠ 0 and µf ≠ 0

4. µd = 0 and µp ≠ 0

Subtopic:  Magnetic Materials |
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For protecting a magnetic needle, it should be placed:

1.  in an iron box.

2.  in a wooden box.

3.  in a metallic box.

4.  none of these.

Subtopic:  Magnetic Materials |
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The correct direction of the magnetic field in the given figures is shown by:

 1 2 3 4
Subtopic:  Magnetic Field & Field Lines |
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Figure shows two small identical magnetic dipoles a and b of magnetic moments M each, placed at a separation 2d, with their axes perpendicular to each other. The magnetic field at the point P midway between the dipoles is:

1. $\frac{2{\mathrm{\mu }}_{0}\mathrm{M}}{4{\mathrm{\pi d}}^{3}}$

2. $\frac{{\mathrm{\mu }}_{0}\mathrm{M}}{4{\mathrm{\pi d}}^{3}}$

3. Zero

4. $\frac{\sqrt{5}{\mathrm{\mu }}_{0}\mathrm{M}}{4{\mathrm{\pi d}}^{3}}$

Subtopic:  Bar Magnet |
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At a certain location in Africa, a compass points 12° west of the geographic north. The north tip of the magnetic needle of a dip circle placed in the plane of magnetic meridian points 60° above the horizontal. The horizontal component of the earth’s field is measured to be 0.16 G. The magnitude of the earth’s field at the location is:

1. 0.16 G

2. 0.48 G

3. 0.32 G

4. 0.30 G

Subtopic:  Earth's Magnetism |
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The vertical component of Earth’s magnetic field at a place is equal to the horizontal component. What is the value of the angle of dip at this place?
1. ${30}^{\mathrm{o}}$
2. ${45}^{\mathrm{o}}$
3. ${60}^{\mathrm{o}}$
4. ${90}^{\mathrm{o}}$

Subtopic:  Earth's Magnetism |
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