There are four light-weight-rod sample 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?

Options

A. B is a paramagnetic material
B. C is of diamagnetic material
C. D is of a ferromagnetic material
D. A is of a nonmagnetic material

Answer

To solve the problem, we need to analyze the behavior of the four samples (A, B, C, and D) when a bar magnet is brought near them. The observations made are as follows:

1. Sample A is feebly repelled.
2. Sample B is feebly attracted.
3. Sample C is strongly attracted.
4. Sample D remains unaffected.

Now, we will classify each sample based on the properties of materials in the presence of a magnetic field.

### Step 1: Analyze Sample A
- **Observation**: A is feebly repelled.
- **Conclusion**: This indicates that sample A is likely a diamagnetic material. Diamagnetic materials are characterized by a weak repulsion in a magnetic field.

### Step 2: Analyze Sample B
- **Observation**: B is feebly attracted.
- **Conclusion**: This suggests that sample B is a paramagnetic material. Paramagnetic materials are attracted to magnetic fields but only weakly.

### Step 3: Analyze Sample C
- **Observation**: C is strongly attracted.
- **Conclusion**: This indicates that sample C is a ferromagnetic material. Ferromagnetic materials exhibit strong attraction to magnetic fields.

### Step 4: Analyze Sample D
- **Observation**: D remains unaffected.
- **Conclusion**: This suggests that sample D is non-magnetic. Non-magnetic materials do not respond to magnetic fields.

### Summary of Findings:
- Sample A: Diamagnetic (feebly repelled)
- Sample B: Paramagnetic (feebly attracted)
- Sample C: Ferromagnetic (strongly attracted)
- Sample D: Non-magnetic (remains unaffected)

### Final Conclusion:
Based on the observations and classifications:
- Sample A is diamagnetic.
- Sample B is paramagnetic.
- Sample C is ferromagnetic.
- Sample D is non-magnetic.

Thus, the true statements about the samples are:
- A is diamagnetic.
- B is paramagnetic.
- C is ferromagnetic.
- D is non-magnetic.

### Final Answer:
The correct classification based on the observations is:
- Sample A is diamagnetic.
- Sample B is paramagnetic.
- Sample C is ferromagnetic.
- Sample D is non-magnetic.