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 \(+x\text-\)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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The unit of pole strength is:
1. \(\text{Am}^2\)
2. \(\text{Am}\)
3. \(\frac{\text{A}^2}{\text{m}}\)
4. \(\frac{\text{A}^2}{\text{m}^2}\)

Subtopic:  Bar Magnet |
 70%
From NCERT
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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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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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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. \(2^{\frac{-1}{3}}\)
3. \(2^{3}\)
4. \(2^{\frac{1}{3}}\)

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 |
 64%
From NCERT
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A sensitive magnetic instrument can be shielded very effectively from outside magnetic fields by placing it inside a box of
1. Teak wood
2. Plastic material
3. Soft iron of high permeability
4. A metal of high conductivity

Subtopic:  Magnetization & Magnetic Intensity |
 68%
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