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Q. No.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: Â Magnetic Field & Field Lines |
 86%
From NCERT
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When cooled below \(4.2\) K, mercury becomes a superconductor, which means it has no electrical resistance. When a current is passed through mercury under these conditions, which one of the following effects will be present?
(a) thermal
(b) chemical
(c) magnetic
Choose the correct option from the given ones:
| 1. | (a) and (c) only |
| 2. | (a), (b) and (c) |
| 3. | (b) only |
| 4. | (c) only |
Subtopic: Â Magnetic Materials |
 51%
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: Â Magnetization & Magnetic Intensity |
 81%
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Given below are two statements:
| Assertion (A): | Gauss's law for magnetism states that the net magnetic flux through any closed surface is zero. |
| Reason (R): | The magnetic monopoles do not exist. North and South poles occur in pairs, allowing vanishing net magnetic flux through the surface. |
| 1. | (A) is True but (R) is False. |
| 2. | (A) is False but (R) is True. |
| 3. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 4. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
Subtopic: Â Analogy between Electrostatics & Magnetostatics |
 72%
From NCERT
NEET - 2022
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Select the correct option based on the statements:
| Statement I: | The magnetic field of a circular loop at very far away point on the axial line varies with distance as like that of a magnetic dipole. |
| Statement II: | The magnetic field due to magnetic dipole varies inversely with the square of the distance from the centre on the axial line. |
| 1. | Statement I is correct and Statement II is incorrect. |
| 2. | Statement I is incorrect and Statement II is correct. |
| 3. | Both Statement I and Statement II are correct. |
| 4. | Both Statement I and Statement II are incorrect. |
Subtopic: Â Analogy between Electrostatics & Magnetostatics |
 54%
From NCERT
NEET - 2022
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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:
Which one of the following is true?
| 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: Â Magnetic Materials |
 88%
From NCERT
AIPMT - 2011
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Given below are two statements:
| Statement I: | All paramagnetic substances become diamagnetic as their temperature is lowered. |
| Statement II: | All ferromagnetic substances become paramagnetic when their temperature is lowered. |
| 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: Â Curie's Law and Hysteresis (OLD NCERT) |
 57%
From NCERT
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Given below are two statements:
| Assertion (A): | Magnetic flux linked with a closed surface is always zero. |
| Reason (R): | Magnetic monopole does not exist. |
| 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: Â Bar Magnet |
 64%
From NCERT
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Soft iron is used to manufacture electromagnets because:
1. It has a high permeability.
2. Its retentivity and coercivity are small.
3. Its retentivity and coercivity are high.
4. Both (1) & (2)
Subtopic: Â Magnetic Materials |
 69%
From NCERT
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To make the electromagnets, the material used should have:
| 1. | low hysteresis loss | 2. | high hysteresis loss |
| 3. | high permeability | 4. | both (1) and (3) |
Subtopic: Â Magnetic Materials |
 86%
From NCERT
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