# 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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A magnetic needle suspended by a silk thread is vibrating in the earth's magnetic field. If the temperature of the needle is increased, then:

 1 the time period decreases. 2 the time period remains unchanged. 3 the time period increases. 4 the time period first decreases then increases.

Subtopic:  Analogy between Electrostatics & Magnetostatics |
From NCERT
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For protecting a magnetic needle, it should be placed:

 1 In an iron box. 2 In a wooden box. 3 In a metallic box. 4 None of these.

Subtopic:  Magnetic Materials |
From NCERT
AIPMT - 1998
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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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Diamagnetic material in a magnetic field moves:

 1 from stronger to the weaker parts of the field 2 from weaker to the stronger parts of the field 3 perpendicular to the field 4 in none of the above directions

Subtopic:  Magnetic Materials |
80%
From NCERT
AIPMT - 2003
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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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Which one of the following is correct?

 1 The magnetic field lines also represent the lines of force on a moving charged particle at every point. 2 Magnetic field lines can be entirely confined within the core of a toroid, but not within a straight solenoid. 3 A bar magnet exerts a torque on itself due to its own field. 4 Magnetic field arises due to stationary charges.

Subtopic:  Magnetic Field & Field Lines |
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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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