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 |
 70%
From NCERT
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. \(\frac{3M}{\pi}\) 2. \(\frac{2M}{l\pi}\)
3. \(\frac{M}{ 2}\) 4. \(M\)
Subtopic:  Bar Magnet |
 77%
From NCERT
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. \(\frac{MB}{F}\)
2. \(\frac{BF}{M}\)
3. \(\frac{MF}{B}\)
4. \(\frac{F}{MB}\)
Subtopic:  Bar Magnet |
 74%
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 |
 68%
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 |
 87%
From NCERT
AIPMT - 2011
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A short bar magnet of magnet moment \(0.4\) JT-1 is placed in a uniform magnetic field of \(0.16\) 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 |
 80%
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 μT. When a horizontal field of 18 μT 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 |
 64%
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 |
 71%
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 |
 67%
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 |
 84%
From NCERT
AIPMT - 2009
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