The following figures show the arrangement of bar magnets in different configurations. Each magnet has magnetic dipole. Which configuration has the highest net magnetic dipole moment?

 1 2 3 4
Subtopic:  Bar Magnet |
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A bar magnet of length ‘l’ and magnetic dipole moment ‘M’ is bent in the form of an arc as shown in the figure. The new magnetic dipole moment will be:

1. 3M/$\mathrm{\pi }$
2. 2M/l$\mathrm{\pi }$
3. M/2
4. M

Subtopic:  Bar Magnet |
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A compass needle which is allowed to move in a horizontal plane is taken to a geomagnetic pole. It

1. will become rigid showing no movement

2. will stay in any position

3. will stay in north-south direction only

4. will stay in east-west direction only

Subtopic:  Earth's Magnetism |
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A magnetic needle suspended parallel to a magnetic field requires $\sqrt{3}$ J of work to turn it through $60°$. The torque needed to maintain the needle in this position will be:

1.  3 J

2.

3.  $\frac{3}{2}J$

4.

Subtopic:  Analogy between Electrostatics & Magnetostatics |
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There are four light-weight-rod samples A, B, C, D separately suspended by threads. A bar magnet is slowly brought near each sample and the following observations are noted:
(i) A is feebly repelled.
(ii) B is feebly attracted.
(iii) C is strongly attracted.
(iv) D remains unaffected.
Which one of the following is true?

1.  C is of a diamagnetic material.
2.  D is of a ferromagnetic material.
3.  A is of a non-magnetic material.
4.  B is of a paramagnetic material.

Subtopic:  Magnetic Materials |
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A short bar magnet of magnet moment 0.4 ${\mathrm{JT}}^{-1}$ is placed in a uniform magnetic field of 0.16 $\mathrm{T}$. The magnet is in stable equilibrium when the potential energy is :
1. 0.064 J
2. – 0.064 J
3. Zero
4. – 0.082 J

Subtopic:  Analogy between Electrostatics & Magnetostatics |
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A vibration magnetometer placed in a magnetic meridian has a small bar magnet. The magnet executes oscillations with a time period of 2 s in the earth's horizontal magnetic field of 24 $\mu$T. When a horizontal field of 18 $\mu$T is produced opposite to the earth's field by placing a current-carrying wire, the new time period of the magnet will be:

1. 1 s

2. 2 s

3. 3 s

4. 4 s

Subtopic:  Bar Magnet |
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Electromagnets are made of soft iron because soft iron has:

1. low retentivity and high coercive force

2. high retentivity and high coercive force

3. low retentivity and low coercive force

4. high retentivity and low coercive force

Subtopic:  Curie's Law and Hysteresis |
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The magnetic moment of a diamagnetic atom is

1. 1

2. between zero and one

3. equal to zero

4. much greater than one

Subtopic:  Magnetic Materials |
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Two identical bar magnets are fixed with their centres at a distance d apart. A stationary charge Q is placed at P in between the gap of the two magnets at a distance D from the centre O as shown in the figure -

The force on the charge Q is in-
1. direction along OP
2. direction along PQ
3. direction perpendicular to the plane of paper
4. zero

Subtopic:  Bar Magnet |
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