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Q. No.Given below are two statements:
Statement I:
The magnetic field of a short bar magnet points from the south-pole to the north-pole within the bar magnet.
Statement II:
Bar magnets are made of ferromagnetic materials, and the magnetic field within is much stronger than that outside.
1.
Statement I is incorrect and Statement II is correct.
2.
Both Statement I and Statement II are correct.
3.
Both Statement I and Statement II are incorrect.
4.
Statement I is correct and Statement II is incorrect.
Subtopic: Magnetic Field & Field Lines |
78%
Level 2: 60%+
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A short bar magnet (moment: \(m\)) is placed at the centre of a solenoid, with its axis along the axis of the solenoid. The magnetic field of the solenoid is \(B,\) at its centre. The torque on the magnet is:
| 1. | \(mB\) | 2. | \(2mB\) |
| 3. | \(\dfrac12mB\) | 4. | zero |
Subtopic: Analogy between Electrostatics & Magnetostatics |
75%
Level 2: 60%+
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A bar magnet is demagnetised by placing it inside a solenoid of length \(0.2~\text{m},\) having \(100\) turns, and carrying a current of \(5.2~\text{A}.\) What is the coercivity of the bar magnet?
| 1. | \(285~\text{A/m}\) | 2. | \(2600~\text{A/m}\) |
| 3. | \(520~\text{A/m}\) | 4. | \(1200~\text{A/m}\) |
Subtopic: Bar Magnet |
78%
Level 2: 60%+
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A rod is made of a material whose magnetic susceptibility is \(499.\) If the permeability of free space is \(4 \pi \times 10^{-7}~ \text{H} /\text{m} \text {, }\)the absolute permeability of the material of the rod is:
| 1. | \(3 \pi \times 10^{-4}~ \text{H} /\text{m}\) | 2. | \(\pi \times 10^{-4}~ \text{H} /\text{m}\) |
| 3. | \(2 \pi \times 10^{-4} ~ \text{H} /\text{m}\) | 4. | \(4 \pi \times 10^{-4}~ \text{H} /\text{m}\) |
Subtopic: Magnetization & Magnetic Intensity |
84%
Level 1: 80%+
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The magnetic moment of an iron bar is \(M.\) It is now bent in such a way that it forms an arc section of a circle subtending an angle of \(60^\circ\) at the centre. The magnetic moment of this arc section is:
| 1. | \(\dfrac{3 M}{\pi}\) | 2. | \(\dfrac{4M}{\pi}\) |
| 3. | \(\dfrac{ M}{\pi}\) | 4. | \(\dfrac{2 M}{\pi}\) |
Subtopic: Bar Magnet |
77%
Level 2: 60%+
NEET - 2024
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The magnetic moment and moment of inertia of a magnetic needle as shown are, respectively, \(1.0\times10^{-2}~\text{A m}^{2}~\text{and}~\frac{10^{-6}}{\pi^{2}}~\text{kg m}^{2}.\) If it completes \(10\) oscillations in \(10~\text s,\) the magnitude of the magnetic field is:
1. \(0.4~\text T\)
2. \(4~\text T\)
3. \(0.4~\text{mT}\)
4. \(4~\text{mT}\)
1. \(0.4~\text T\)
2. \(4~\text T\)
3. \(0.4~\text{mT}\)
4. \(4~\text{mT}\)
Subtopic: Bar Magnet |
80%
Level 1: 80%+
NEET - 2024
Hints
A bar magnet with a magnetic moment of \(0.5~\text{A-m}^2\) is suspended in a uniform magnetic field of \(8 \times 10^{-2}~\text{T}.\) How much work is required to rotate the magnet from its most stable position to its most unstable position?
1. \(16 \times 10^{-2}\) J
2. zero
3. \(8 \times 10^{-2}\) J
4. \(4 \times 10^{-2}\) J
1. \(16 \times 10^{-2}\) J
2. zero
3. \(8 \times 10^{-2}\) J
4. \(4 \times 10^{-2}\) J
Subtopic: Analogy between Electrostatics & Magnetostatics |
72%
Level 2: 60%+
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Paramagnetic substances:
Choose the most appropriate answer from the options given below:
1. (A), (C) only
2. (B), (D) only
3. (A), (B), (C), (D)
4. (A), (B), (C) only
| (A) | Align themselves along the directions of the external magnetic field. |
| (B) | Attract strongly towards an external magnetic field. |
| (C) | Has susceptibility little more than zero. |
| (D) | Move from a region of strong magnetic field to a weak magnetic field. |
Choose the most appropriate answer from the options given below:
1. (A), (C) only
2. (B), (D) only
3. (A), (B), (C), (D)
4. (A), (B), (C) only
Subtopic: Magnetic Materials |
72%
Level 2: 60%+
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Given below are two statements:
| Assertion (A): | Magnetic dipoles, when placed near a long straight current-carrying wire, are deflected perpendicular to the wire. |
| Reason (R): | The magnetic field lines of a straight current-carrying wire are oriented in a direction which is perpendicular to the wire. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Subtopic: Analogy between Electrostatics & Magnetostatics |
80%
Level 1: 80%+
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When the current through an iron-cored electromagnet is gradually increased, it is observed that there are crackling sounds emerging from the interior of the magnet. These are due to:
| 1. | thermal expansion |
| 2. | magnetisation and the movement of domains |
| 3. | electromagnetic radiation |
| 4. | electrical charges in the magnet |
Subtopic: Magnetization & Magnetic Intensity |
77%
Level 2: 60%+
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