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Q. No.Consider the following statements:
| (a) | The magnetic field is produced only by electric charges. |
| (b) | Magnetic poles are only mathematical assumptions having no real existence. |
| (c) | A north pole is equivalent to a clockwise current and a south pole is equivalent to an anticlockwise current. |
| (d) | A bar magnet is equivalent to a long, straight current. |
Choose the correct option from the given ones:
| 1. | (a) and (b) only |
| 2. | (b) and (c) only |
| 3. | (c) and (d) only |
| 4. | (a) and (d) only |
A paramagnetic material is placed in a magnetic field. Consider the following statements:
| A: | If the magnetic field is increased, the magnetization is increased. |
| B: | If the temperature is increased, the magnetization is increased. |
| 1. | Both A and B are true |
| 2. | A is true but B is false |
| 3. | B is true but A is false |
| 4. | Both A and B are false |
A paramagnetic material is kept in a magnetic field. The field is increased till the magnetization becomes constant. If the temperature is now decreased, the magnetization:
| 1. | will increase |
| 2. | decrease |
| 3. | remain constant |
| 4. | may increase or decrease |
A ferromagnetic material is placed in an external magnetic field. The magnetic domains:
| 1. | increase in size |
| 2. | decrease in size |
| 3. | may increase or decrease in size |
| 4. | have no relation with the field |
| 1. | increase many times | 2. | decrease many times |
| 3. | remain almost constant | 4. | become zero |
The magnetic susceptibility is negative for:
| 1. | paramagnetic materials only |
| 2. | diamagnetic materials only |
| 3. | ferromagnetic materials only |
| 4. | paramagnetic and ferromagnetic materials |
The permanent magnetic moment of the atoms of a material is not zero. The material:
| (a) | must be paramagnetic | (b) | must be diamagnetic |
| (c) | must be ferromagnetic | (d) | may be paramagnetic |
| 1. | (a), (b) | 2. | (b), (c) |
| 3. | (c), (d) | 4. | (d) only |
The permanent magnetic moment of the atoms of a material is zero. The material:
| a. | must be paramagnetic |
| b. | must be diamagnetic |
| c. | must be ferromagnetic |
| d. | may be paramagnetic |
Choose the correct option:
1. (a), (b)
2. (b) only
3. (c), (d)
4. (a), (d)
Mark out the correct options.
(a) Diamagnetism occurs in all materials.
(b) Diamagnetism results from the partial alignment of permanent magnetic moment.
(c) The magnetizing field intensity H is always zero in free space.
(d) The magnetic field of induced magnetic moment is opposite to the applied field.
Choose the correct option
1. (a), (b)
2. (b), (c)
3. (c), (d)
4. (a), (d)
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Q. No.
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