# 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) |
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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 |
69%
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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%
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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) ${r}^{2}$

(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 |
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Oersted is a unit of :

(1) Dip

(2) Magnetic intensity

(3) Magnetic moment

(4) Pole strength

51%
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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.  $\frac{3\mathrm{M}}{2\mathrm{\pi }}$

2.  $\frac{3\sqrt{3}\mathrm{M}}{2\mathrm{\pi }}$

3.  $\frac{3\mathrm{M}}{\mathrm{\pi }}$

4.  $\frac{2\mathrm{M}}{\mathrm{\pi }}$

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 |
63%
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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 ${30}^{o}$ in C.G.S. units is
(1) 6

(2) $3\sqrt{3}$

(3) $3\left(2-\sqrt{3}\right)$

(4) 3

Subtopic:  Analogy between Electrostatics & Magnetostatics |
64%
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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%
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