- 1(current)
Q. No.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 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. |
| 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 |
 87%
From NCERT
AIPMT - 2011
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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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To make the permanent magnets, the material used should have:
1. low hysteresis loss
2. high hysteresis loss
3. high retentivity and coercivity
4. both (2) and (3)
1. low hysteresis loss
2. high hysteresis loss
3. high retentivity and coercivity
4. both (2) and (3)
Subtopic: Â Magnetic Materials |
 61%
From NCERT
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- 1(current)
Q. No.
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