- 1(current)
Q. No.Choose the correct statement regarding magnetism.
| 1. | Paramagnetic sample displays greater magnetization when cooled. |
| 2. | Diamagnetism is almost independent of temperature. |
| 3. | Ferromagnetic substances show hysteresis. |
| 4. | All of these. |
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 the magnetic dipole moment of an atom of diamagnetic material, paramagnetic material and ferromagnetic material are denoted by \(\mu_d,~\mu_p,~\text{and}~\mu_f\) respectively, then:
1. \(\mu_p= 0 ~\text{and}~\mu_f \ne0\)
2. \(\mu_d\neq 0 ~\text{and}~\mu_p=0\)
3. \(\mu_d\ne 0 ~\text{and}~\mu_f \ne0\)
4. \(\mu_d= 0 ~\text{and}~\mu_p \ne0\)
The material which is used to make permanent magnet has:
| 1. | High retentivity, low coercivity |
| 2. | Low retentivity, low coercivity |
| 3. | Low retentivity, high coercivity |
| 4. | High retentivity, high coercivity |
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. | \(OA\) |
A frog can be levitated in a magnetic field produced by a current in a vertical solenoid placed below the frog. This is possible because the body of the frog behaves as:
| 1. | Paramagnetic | 2. | Diamagnetic |
| 3. | Ferromagnetic | 4. | None of these |
The variation of magnetic susceptibility with temperature for a diamagnetic substance is best represented by:
| 1. |  |
2. |  |
| 3. |  |
4. |  |
- 1(current)
Q. No.
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