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. (a) C is of diamagnetic material
B. (b) D is of paramagnetic material
C. (c) A is of non magnetic material
D. (d) B is of paramagnetic 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. Based on the observations, we can categorize each sample based on its magnetic properties.

### Step-by-Step Solution:

1. **Identify the Behavior of Each Sample:**
- Sample A is **feebly repelled**.
- Sample B is **feebly attracted**.
- Sample C is **strongly attracted**.
- Sample D **remains unaffected**.

2. **Determine the Type of Material for Each Sample:**
- **Sample A (Feebly Repelled):**
- This behavior indicates that Sample A is a **diamagnetic material**. Diamagnetic materials are characterized by their weak opposition to an external magnetic field, resulting in a feeble repulsion.

- **Sample B (Feebly Attracted):**
- Sample B's feeble attraction suggests that it is a **paramagnetic material**. Paramagnetic materials have unpaired electrons that align with an external magnetic field, leading to a weak attraction.

- **Sample C (Strongly Attracted):**
- The strong attraction of Sample C indicates that it is a **ferromagnetic material**. Ferromagnetic materials have a strong response to magnetic fields due to their aligned magnetic dipoles, resulting in strong attraction.

- **Sample D (Remains Unaffected):**
- Since Sample D shows no response to the magnetic field, it is classified as a **non-magnetic material**. Non-magnetic materials do not exhibit any magnetic properties.

3. **Summarize the Findings:**
- Sample A: Diamagnetic
- Sample B: Paramagnetic
- Sample C: Ferromagnetic
- Sample D: Non-magnetic

4. **Conclusion:**
- Based on the observations and the classifications, the correct identification of the samples is:
- A is **diamagnetic** (feebly repelled)
- B is **paramagnetic** (feebly attracted)
- C is **ferromagnetic** (strongly attracted)
- D is **non-magnetic** (remains unaffected)

### Final Answer:
- The true statements regarding the samples are:
- A is diamagnetic,
- B is paramagnetic,
- C is ferromagnetic,
- D is non-magnetic.