A susceptibility of a certain magnetic material is 400. What is the class of the magnetic material?

Options

A. Diamagnetic
B. Paramagnetic
C. Ferromagnetic
D. Ferroelectric

Explanation

To determine the class of the magnetic material based on its susceptibility, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Magnetic Susceptibility**:
- Magnetic susceptibility (χ) is a measure of how much a material will become magnetized in an applied magnetic field. It is defined as the ratio of the intensity of magnetization (I) to the applied magnetic field strength (H).
- Mathematically, it is expressed as:
\[ \chi = \frac{I}{H} \]

2. **Given Value**:
- In this problem, the susceptibility of the magnetic material is given as χ = 400.

3. **Classifying Magnetic Materials**:
- Magnetic materials can be classified based on their susceptibility:
- **Diamagnetic materials**: χ < 0 (very weakly repelled by a magnetic field)
- **Paramagnetic materials**: 0 < χ < 1 (weakly attracted by a magnetic field)
- **Ferromagnetic materials**: χ >> 1 (strongly attracted by a magnetic field)
- **Ferrimagnetic materials**: Similar to ferromagnetic but with different magnetic moments.

4. **Analyzing the Given Susceptibility**:
- Since the susceptibility χ = 400 is much greater than 1, we can conclude that the material exhibits strong magnetization.

5. **Conclusion**:
- Therefore, the magnetic material with a susceptibility of 400 is classified as a **ferromagnetic material**.

### Final Answer:
The class of the magnetic material is **ferromagnetic material**.

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