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

 1 2 3 4   Subtopic:  Bar Magnet |
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AIPMT - 2014
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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 $$3M/ \pi$$ 2 $$2M/ l\pi$$ 3 $$M/ 2$$ 4 $$M$$  Subtopic:  Bar Magnet |
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AIPMT - 2013
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A bar magnet of the magnetic moment $$M$$ is placed at right angles to a magnetic induction $$B.$$ If a force $$F$$ is experienced by each pole of the magnet, the length of the magnet will be:
1. $$MB/F$$
2. $$BF/M$$
3. $$MF/B$$
4. $$F/MB$$  Subtopic:  Bar Magnet |
72%
From NCERT
NEET - 2013
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A magnetic needle suspended parallel to a magnetic field requires $$\sqrt{3}~\mathrm{J}$$ of work to turn it through $$60^\circ$$. The torque needed to maintain the needle in this position will be:
1. $$3$$ N-m
2. $$\sqrt{3}$$ N-m
3. $$\frac32$$ N-m
4. $$2\sqrt{3}$$ N-m  Subtopic:  Analogy between Electrostatics & Magnetostatics |
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From NCERT
AIPMT - 2012
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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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From NCERT
AIPMT - 2011
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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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From NCERT
AIPMT - 2011
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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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From NCERT
AIPMT - 2010
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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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From NCERT
AIPMT - 2010
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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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From NCERT
AIPMT - 2010
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If a diamagnetic substance is brought near the north or the south pole of a bar magnet, it is:

 1 repelled by both the poles 2 repelled by the north pole and attracted by the south pole 3 attracted by the north pole and repelled by the south pole 4 attracted by both the poles  Subtopic:  Magnetic Materials |
83%
From NCERT
AIPMT - 2009
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