The magnetic susceptibility is negative for

Options

A. diamagnetism materials
B. Paramagnetic materials
C. Ferromagnetic materials
D. all of these

Answer

To solve the question, "The magnetic susceptibility is negative for," we will analyze the properties of different types of magnetic materials.

### 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 indicates the degree of magnetization of a material in response to an external magnetic field.

2. **Types of Magnetic Materials**:
- There are three main types of magnetic materials: diamagnetic, paramagnetic, and ferromagnetic.
- **Diamagnetic Materials**: These materials have a negative magnetic susceptibility. They are repelled by magnetic fields and do not retain magnetic properties when the external field is removed.
- **Paramagnetic Materials**: These materials have a small positive magnetic susceptibility. They are weakly attracted by magnetic fields and do not retain magnetization once the external field is removed.
- **Ferromagnetic Materials**: These materials have a large positive magnetic susceptibility. They can be strongly attracted to magnetic fields and can retain magnetization even after the external field is removed.

3. **Analyzing the Options**:
- Given the options:
- A) Diamagnetic material
- B) Paramagnetic material
- C) Ferromagnetic material
- D) All of these
- From our understanding, we know that only diamagnetic materials exhibit negative magnetic susceptibility.

4. **Conclusion**:
- Therefore, the correct answer to the question "The magnetic susceptibility is negative for" is **A) Diamagnetic material**.