If a bar magnet is kept on a horizontal plane with N-pole of bar magnet facing geographic N-pole and S-pole of bar magnet facing geographic S-pole, then the number of neutral points is:

1. 0 2.
3. 2 4. Infinite
 53%
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The correct direction of the magnetic field in the given figures is shown by:

1.  2.
3. 4.
Subtopic:  Magnetic Field & Field Lines |
 92%
From NCERT
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A current-carrying loop is placed in a uniform magnetic field in four different orientations, I, II, III & IV. The decreasing order of potential energy is:

1. I > III > II > IV 2. I > II >III > IV
3. I > IV > II > III 4. III > IV > I > II

 
Subtopic:  Analogy between Electrostatics & Magnetostatics |
 65%
From NCERT
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A bar magnet is hung by a thin cotton thread in a uniform horizontal magnetic field and is in the equilibrium state. The energy required to rotate it by 60 is WNow the torque required to keep the magnet in this new position is:
1. W3 
2. 3W
3. 3W2 
4. 2W3

Subtopic:  Analogy between Electrostatics & Magnetostatics |
 79%
From NCERT
NEET - 2016
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A short bar magnet of magnetic moment 0.4 J/T 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. zero
3. 0.082 J 
4. 0.064 J 

Subtopic:  Analogy between Electrostatics & Magnetostatics |
 76%
From NCERT
NEET - 2011
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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. 3Mπ 2. 2Mlπ
3. M2 4. M
Subtopic:  Bar Magnet |
 80%
From NCERT
AIPMT - 2013
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Due to a small magnet, the intensity at a distance x in the end-on position is 9 gauss. What will be the intensity at a distance x2 on equatorial position?
1. 9 gauss 2. 4 gauss
3. 36 gauss 4. 4.5 gauss
Subtopic:  Bar Magnet |
 75%
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The magnetic field at a point x on the axis of a small bar magnet is equal to the field at a point y on the equator of the same magnet. The ratio of the distances of x and y from the centre of the magnet is:
1. 23
2. 213
3. 23
4. 213

Subtopic:  Bar Magnet |
 65%
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Two magnets A and B are identical and these are arranged as shown in the figure. Their length is negligible in comparison to the separation between them. A magnetic needle is placed between the magnets at point P which gets deflected through an angle θ under the influence of magnets. The ratio of distance d1 and d2 will be:
   
1. (2tanθ)13
2. (2tanθ)13
3. (2cotθ)13
4. (2cotθ)13

Subtopic:  Bar Magnet |
 52%
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Two short magnets of equal dipole moments M are fastened perpendicularly at their centres (figure). The magnitude of the magnetic field at a distance d from the centre on the bisector of the right angle is:

 
1. μ04πMd3 2. μ04πM2d3
3. μ04π22Md3 4. μ04π2Md3
Subtopic:  Bar Magnet |
 54%
From NCERT
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