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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The earth’s magnetic field at the equator is approximately 0.4 G. The earth’s dipole moment is:
(Radius of earth, \(R_{E}=6.4\times10^{6} \) m)
1. \(1.05\times10^{23}\) A-m2
2. \(8.0\times10^{22}\) A-m2
3. \(4.5\times10^{23}\) A-m2
4. \(2.10\times10^{23}\) A-m2

Subtopic:  Earth's Magnetism |
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In the magnetic meridian of a certain place, the horizontal component of the earth’s magnetic field is 0.26G and the dip angle is 60°. The magnetic field of the earth at this location is:

1. 0.25 G

2. 0.20 G

3. 0.35 G

4. 0.52 G

Subtopic:  Earth's Magnetism |
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A solenoid has a core of material with relative permeability 400. The windings of the solenoid are insulated from the core and carry a current of 2A. If the number of turns is 1000 per metre, the magnetic field intensity H is:

1. 2×102 A/m2.  2×103 A/m3.  2 A/m4. 20 A/m

Subtopic:  Magnetization & Magnetic Intensity |
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A solenoid has a core of material with relative permeability 400. The windings of the solenoid are insulated from the core and carry a current of 2A. If the number of turns is 1000 per metre, the magnetising field B is:

1. 10 T

2. 1 T

3. 0.1 T

4. 2 T

Subtopic:  Magnetization & Magnetic Intensity |
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A solenoid has a core of material with relative permeability 400. The windings of the solenoid are insulated from the core and carry a current of 2A. If the number of turns is 1000 per metre, the magnetization, M is:

1. 8×105 A/m2. 6×105 A/m3. 6.5×105 A/m4 8.9×105 A/m

Subtopic:  Magnetization & Magnetic Intensity |
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A solenoid has a core of material with relative permeability 400. The windings of the solenoid are insulated from the core and carry a current of 2A. If the number of turns is 1000 per metre, the magnetizing current Im is:

1. 746 A

2. 700 A

3. 729 A

4. 794 A

Subtopic:  Magnetization & Magnetic Intensity |
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A domain in ferromagnetic iron is in the form of a cube of side length 1µm. The maximum possible dipole moment is:

[The molecular mass of iron is 55 g/mole and its density is 7.9 g/cm3. Assume that each iron atom has a dipole moment of 9.27×10–24 A m2] 

1. 8.0×10-13 A m22. 8.0×10-12 A m23. 7.0×10-13 A m24. 7.0×10-12 A m2

Subtopic:  Magnetic Materials |
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A domain in ferromagnetic iron is in the form of a cube of side length 1µm. The magnetisation of the domain is:

[The molecular mass of iron is 55 g/mole and its density is 7.9 g/cm3. Assume that each iron atom has a dipole moment of 9.27×10–24 A m2] 

1. 9.0×105 Am-12. 8.0×105 Am-13. 11×105 Am-14. 3.0×105 Am-1

Subtopic:  Magnetic Materials |
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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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