# In the figure, the magnetic needle has a magnetic moment of 6.7 × 10–2 Am2 and a moment of inertia I = 7.5 × 10–6 kg m2. It performs 10 complete oscillations in 6.70 s in a magnetic field. What is the magnitude of the magnetic field? 1. 0.02 T 2. 0.01 T 3. 003 T 4. 0.001 T

Subtopic:  Bar Magnet |
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A short bar magnet placed with its axis at 30° with an external field of 800 G experiences a torque of 0.016 Nm. What is the magnetic moment of the magnet?

Subtopic:  Bar Magnet |
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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  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  configuration, the system is not in equilibrium.

(2) In configuration, the system is unstable.

(3) In  configuration, the system is stable.

(4) $P{Q}_{5}$ 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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