The figure shows a small magnetized needle P placed at a point O. The arrow shows the direction of its magnetic moment. The other arrows show different positions (and orientations of the magnetic moment) of another identical magnetized needle Q. Then:

(1) In PQ1 and PQ2 configuration, the system is not in equilibrium.

(2) In PQ3 and PQ6 configuration, the system is unstable.

(3) In PQ5 and PQ4 configuration, the system is stable.

(4) PQ5 configuration corresponds to the lowest potential energy among all the configurations shown.

Subtopic:  Analogy between Electrostatics & Magnetostatics |
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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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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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