Which of the following is true?

Options

A. Diamagnetism is temperature dependent
B. Paramagnetism is temperature dependnt
C. Paramagnetism is magnetic independent
D. None of these

Answer

To solve the question regarding which of the given statements about magnetism is true, we will analyze each option based on our understanding of diamagnetism and paramagnetism.

### Step-by-Step Solution:

1. **Understanding Diamagnetism**:
- Diamagnetism is a property of materials that causes them to create an opposing magnetic field when exposed to an external magnetic field. This effect is generally very weak and is not dependent on temperature.
- **Conclusion**: Diamagnetism is **not** temperature dependent.

2. **Understanding Paramagnetism**:
- Paramagnetism is a property of materials that have unpaired electrons, which align with an external magnetic field. The susceptibility of paramagnetic materials is indeed temperature dependent; as temperature increases, thermal agitation can disrupt the alignment of magnetic moments, decreasing susceptibility.
- **Conclusion**: Paramagnetism **is** temperature dependent.

3. **Analyzing the Options**:
- **Option A**: "Diamagnetism is temperature dependent." - **False** (as established above).
- **Option B**: "Paramagnetism is temperature dependent." - **True** (as established above).
- **Option C**: "Paramagnetism is magnetic independent." - **False** (paramagnetism is dependent on the presence of an external magnetic field).
- **Option D**: "None of the above." - **False** (since option B is true).

4. **Final Conclusion**:
- The only true statement among the options provided is **Option B**: "Paramagnetism is temperature dependent."

### Summary of the Solution:
- The correct answer is **Option B**.