A bar magnet of length l and magnetic dipole moment M is bent to form an arc which subtends an angle of 120° at centre. The new magnetic dipole moment will be

1.  3M2π

2.  33M2π

3.  3Mπ

4.  2Mπ

Subtopic:  Bar Magnet |
 57%
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A small bar magnet is placed with its north pole facing the magnetic north pole. The neutral points are located at a distance r from its centre. If the magnet is rotated by 180o, the neutral point shall be obtained at a distance of:
1. \(2r\)
2. \(\sqrt{2}r\)
3. \(2^{\frac{1}{3}}r\)
4. \(\frac{r}{2\sqrt{2}}\)

Subtopic:  Earth's Magnetism (OLD NCERT) |
From NCERT
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The unit of pole strength is:

1. Am2

2. Am

3. A2m

4. A2m2

Subtopic:  Bar Magnet |
 69%
From NCERT
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Magnetic field lines

1. Cannot intersect

2. Are always closed curves

3. Can pass through vacuum

4. All of these

Subtopic:  Magnetic Field & Field Lines |
 84%
From NCERT
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Two small bar magnets are placed in the air at a distance r apart. The magnetic force between them is proportional to:

(1) r2

(2) r-2

(3) r-3

(4) r-4

Subtopic:  Analogy between Electrostatics & Magnetostatics |
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A short magnetic dipole is placed at the origin with its dipole movement directed along the +x-axis. If magnetic field induction at a point P (r, 0) is \(B\hat{i}\), the magnetic field induction at point Q (0, 2r) will be:

1. \(-\frac{B}{16}\hat{i}\)

2. \(-\frac{B}{8}\hat{j}\)

3. \(\frac{B}{16}\hat{j}\)

4. \(-\frac{B}{16}\hat{j}\)

Subtopic:  Bar Magnet |
From NCERT
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Oersted is a unit of :

(1) Dip

(2) Magnetic intensity

(3) Magnetic moment

(4) Pole strength

 50%
From NCERT
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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. 2-3

2. 2-13

3. 23

4. 213

Subtopic:  Bar Magnet |
 64%
From NCERT
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A magnet of magnetic moment 20 C.G.S. units are freely suspended in a uniform magnetic field of intensity 0.3 C.G.S. units. The amount of work done in deflecting it by an angle of 30o in C.G.S. units is
(1) 6

(2) 33

(3) 3(2-3)

(4) 3

Subtopic:  Analogy between Electrostatics & Magnetostatics |
 64%
From NCERT
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The magnetic field due to a short magnet at a point on its axis at a distance X cm from the middle point of the magnet is 200 Gauss. The magnetic field at a point on the neutral axis at a distance of X cm from the middle of the magnet is:


1. 100 Gauss

2. 400 Gauss

3. 50 Gauss

4. 200 Gauss

Subtopic:  Analogy between Electrostatics & Magnetostatics |
 65%
From NCERT
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