# Which of the following is the correct representation of magnetic field lines?   1. (g), (c) 2. (d), (f) 3. (a), (b) 4. (c), (e)

Subtopic:  Magnetic Field & Field Lines |
86%
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If the magnetic dipole moment of an atom of diamagnetic material, paramagnetic material and ferromagnetic material are denoted by µd, µp, and µf respectively, then:

1. µp = 0 and µf ≠ 0

2. µd ≠ 0 and µp = 0

3. µd ≠ 0 and µf ≠ 0

4. µd = 0 and µp ≠ 0

Subtopic:  Magnetic Materials |
79%
From NCERT
AIPMT - 2005
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Figure shows two small identical magnetic dipoles a and b of magnetic moments M each, placed at a separation 2d, with their axes perpendicular to each other. The magnetic field at the point P midway between the dipoles is:

1. $\frac{2{\mathrm{\mu }}_{0}\mathrm{M}}{4{\mathrm{\pi d}}^{3}}$

2. $\frac{{\mathrm{\mu }}_{0}\mathrm{M}}{4{\mathrm{\pi d}}^{3}}$

3. Zero

4. $\frac{\sqrt{5}{\mathrm{\mu }}_{0}\mathrm{M}}{4{\mathrm{\pi d}}^{3}}$

Subtopic:  Bar Magnet |
68%
From NCERT
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Choose the correct statement regarding magnetism.

 1 Paramagnetic sample displays greater magnetization when cooled. 2 Diamagnetism is almost independent of temperature. 3 Ferromagnetic substances show hysteresis. 4 All of these.

Subtopic:  Magnetic Materials |
91%
From NCERT
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A Gaussian surface is drawn enclosing the N-pole of a bar magnet. The net magnetic flux through the Gaussian surface will be:
(pole strength of N-pole is treated as positive and S-pole as negative)

 1 positive. 2 negative. 3 positive or negative. 4 zero.

Subtopic:  Bar Magnet |
65%
From NCERT
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The magnetization of a piece of iron or steel:

 1 depends on the strength of the magnetizing field. 2 depends on external conditions such as temperature. 3 cannot be done beyond the saturation point. 4 all of these.

Subtopic:  Magnetization & Magnetic Intensity |
88%
From NCERT
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Due to a small magnet, the intensity at a distance $$x$$ in the end-on position is $$9~\text{gauss}$$. What will be the intensity at a distance $$\frac{x}{2}$$ on equatorial position?
1. $$9~\text{gauss}$$
2. $$4~\text{gauss}$$
3. $$36~\text{gauss}$$
4. $$4.5~\text{gauss}$$

Subtopic:  Bar Magnet |
74%
From NCERT
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The magnetic moment of a magnet $$(10 ~cm\times 4~cm\times1~cm)$$ is $$4 ~Am^2$$. Its intensity of magnetisation is:

1. 10A/m

2. 10A/m

3. 10A/m

4. 10A/m

Subtopic:  Magnetization & Magnetic Intensity |
78%
From NCERT
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The material which is used to make permanent magnet has:

 1 High retentivity, low coercivity 2 Low retentivity, low coercivity 3 Low retentivity, high coercivity 4 High retentivity, high coercivity

Subtopic:  Magnetic Materials |
74%
From NCERT
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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 |
88%
From NCERT
NEET - 2011
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