Q. No.A uniform magnetic field, parallel to the plane of the paper existed in space initially directed from left to right. When a bar of soft iron is placed in the field parallel to it, the lines of force passing through it will be represented by:
1.
2.
3.
4.
A dip needle vibrates in the vertical plane perpendicular to the magnetic meridian. The time period of vibration is found to be 2 seconds. If the same needle is then allowed to vibrate in the horizontal plane and the time period is again found to be 2 seconds, then the angle of dip is:
1. 0o
2. 30o
3. 45o
4. 90o
A dip needle in a plane perpendicular to magnetic meridian will remain:
1. Vertical
2. Horizontal
3. In any direction
4. At an angle of dip to the horizontal
The earth's magnetic field at a certain place has a horizontal component 0.3 Gauss and the total strength 0.5 Gauss. The angle of dip is:
1.
2.
3.
4.
A superconductor exhibits perfect:
1. Ferrimagnetism
2. Ferromagnetism
3. Paramagnetism
4. Diamagnetism
Two short magnets of equal dipole moments \(M\) are fastened perpendicularly at their centres (figure). The magnitude of the magnetic field at a distance \(d\) from the centre on the bisector of the right angle is:
| 1. | \(\frac{\mu_{0}}{4 \pi}\frac{M}{d^{3}}\) | 2. | \(\frac{\mu_{0}}{4 \pi}\frac{M \sqrt{2}}{d^{3}}\) |
| 3. | \(\frac{\mu_{0}}{4 \pi}\frac{2 \sqrt{2} M}{d^{3}}\) | 4. | \(\frac{\mu_{0}}{4 \pi}\frac{2 M}{d^{3}}\) |
The variation of magnetic susceptibility with temperature for a diamagnetic substance is best represented by:
| 1. |  |
2. |  |
| 3. |  |
4. |  |
The variation of the intensity of magnetisation \((I)\) with respect to the magnetising field \((H)\) in a diamagnetic substance is described by the graph:
| 1. | \(OD\) | 2. | \(OC\) |
| 3. | \(OB\) | 4. | \(OA\) |
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:
| 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 |
If a diamagnetic substance is brought near the north or the south pole of a bar magnet, it is:
| 1. | repelled by both the poles |
| 2. | repelled by the north pole and attracted by the south pole |
| 3. | attracted by the north pole and repelled by the south pole |
| 4. | attracted by both the poles |
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