Choose the correct statement:

Options

A. A paramagnetic material tends to move from a strong magnetic field to weak magnetic field.
B. A magnetic material is in the paramagnetic phase below its Curie temperature.
C. The resultant magnetic moment in an atom of a diamagnetic substance is zero.
D. Typical domain size of a ferromagnetic material is 1 nm.

Explanation

To solve the question, we need to analyze each of the four statements provided and determine which one is correct.

### Step-by-Step Solution:

1. **Analyze Statement A**:
- Statement A claims that a paramagnetic material tends to move from a strong magnetic field to a weaker magnetic field.
- **Explanation**: This statement is incorrect. Paramagnetic materials actually tend to move from a weaker magnetic field to a stronger magnetic field because the unpaired electrons align with the external magnetic field, resulting in a net magnetization that causes the material to be attracted towards the stronger field.

2. **Analyze Statement B**:
- Statement B states that a magnetic material is in the paramagnetic phase below its Curie temperature.
- **Explanation**: This statement is also incorrect. A magnetic material is in the ferromagnetic phase below its Curie temperature. Above the Curie temperature, the material becomes paramagnetic. Therefore, this statement is false.

3. **Analyze Statement C**:
- Statement C claims that the resultant magnetic moment in an atom of a diamagnetic substance is 0.
- **Explanation**: This statement is correct. Diamagnetic substances have all their electrons paired, meaning there are no unpaired electrons to contribute to a net magnetic moment. Thus, the resultant magnetic moment is indeed zero.

4. **Analyze Statement D**:
- Statement D states that the typical domain size of a ferromagnetic material is 1 nanometer.
- **Explanation**: This statement is incorrect. The typical domain size of ferromagnetic materials ranges from 0.1 millimeter to 1 millimeter, which is much larger than 1 nanometer. Therefore, this statement is false.

### Conclusion:
After analyzing all four statements, we find that only Statement C is correct.

**Final Answer**: Statement C is the only correct statement.

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