A short bar magnet placed with its axis at 30° with an external field of 800 G experiences a torque of 0.016 N-m. What is the work done in moving it from its most stable to the most unstable position?

1. 0.036 J

2. 0.016 J

3. 0.064 J

4. 0

Subtopic:  Bar Magnet |
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A solenoid of cross-sectional area 2×10-4 m2 and 1000 turns placed with its axis at 30° with an external field of 800 G experiences a torque of 0.016 Nm. The current flowing through the solenoid is:

1. 2 A

2. 4 A

3. 1 A

4. 5 A

Subtopic:  Bar Magnet |
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The ratio of the magnitudes of the equatorial and axial fields due to a bar magnet of length 5.0 cm at a distance of 50 cm from its mid-point is:
(Given, the magnetic moment of the bar magnet is \(0.40~Am^{2}.\))
1. \(\frac{1}{2}\)
2. \(2\)
3. \(1\)
4. 
\(\frac{3}{2}\)

Subtopic:  Analogy between Electrostatics & Magnetostatics |
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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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