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Q. No.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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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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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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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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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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Subtopic: Magnetic Field & Field Lines |
91%
From NCERT
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A \(100\)-turn coil of wire of size \(2~\mathrm{cm}\times 1.5~\mathrm{cm}\) is suspended between the poles of a magnet producing a field of \(1\) T, inside a galvanometer. Calculate the torque on the coil due to a current of \(0.1~\mathrm{A}\) passing through the coil.
1. \(3 \times 10^{-5}\) N-m
2. \(30\) N-m
3. \(3 \times 10^{-3}\) N-m
4. \(3 \times 10^{-2}\) N-m
1. \(3 \times 10^{-5}\) N-m
2. \(30\) N-m
3. \(3 \times 10^{-3}\) N-m
4. \(3 \times 10^{-2}\) N-m
Subtopic: Bar Magnet |
81%
From NCERT
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There are two materials \(A\) and \(B\). The material \(B\) have high coercivity and \(A\) have low coercivity. The hysteresis loop area of material \(A\) is lesser than the material \(B\). Then:
| 1. | material \(A\) is preferred for making electromagnets. |
| 2. | material \(B\) is preferred for making permanent magnets. |
| 3. | material \(A\) is preferred for using electric generators and transformers. |
| 4. | all of these. |
Subtopic: Magnetization & Magnetic Intensity |
82%
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Two identical bar magnets are kept as shown in the figure. The direction of the resultant magnetic field, indicated by the arrowhead at the point \(\mathrm{P}\) is:
| 1. |  |
| 2. |  |
| 3. |  |
| 4. |  |
Subtopic: Magnetic Field & Field Lines |
56%
From NCERT
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A magnet of magnetic dipole moment \(10\hat{i}\) A-m2 is placed along the x-axis in a magnetic field \(\vec B=(\widehat i+2\widehat j)\) T. The torque acting on the magnet is:
1. \((30\widehat k)\) N-m
2. \((10\widehat i+20\widehat j)\) N-m
3. \((20\widehat k)\) N-m
4. \((-30\widehat k)\) N-m
1. \((30\widehat k)\) N-m
2. \((10\widehat i+20\widehat j)\) N-m
3. \((20\widehat k)\) N-m
4. \((-30\widehat k)\) N-m
Subtopic: Magnetic Field & Field Lines |
85%
From NCERT
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