Relative permeability of a magnetic material is 0.5. The material is

Options

A. diamagnetic
B. ferromagnetic
C. paramagnetic
D. not a magnetic material

Explanation

To determine the type of magnetic material based on its relative permeability, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Relative Permeability**:
The relative permeability (\( \mu_r \)) of a material is defined as the ratio of the permeability of the material (\( \mu \)) to the permeability of free space (\( \mu_0 \)):
\[ \mu_r = \frac{\mu}{\mu_0} \]

2. **Identify the Given Value**:
In this case, we are given that the relative permeability \( \mu_r = 0.5 \).

3. **Analyze the Value of Relative Permeability**:
Since \( \mu_r = 0.5 \), this value is less than 1:
\[ \mu_r < 1 \]

4. **Determine the Type of Material**:
- If \( \mu_r < 1 \), the material is classified as **diamagnetic**. Diamagnetic materials have a weak negative response to magnetic fields and tend to repel magnetic field lines.
- If \( \mu_r = 1 \), the material is **non-magnetic**.
- If \( \mu_r > 1 \), the material is either **paramagnetic** (weakly attracted to magnetic fields) or **ferromagnetic** (strongly attracted to magnetic fields).

5. **Conclusion**:
Since the relative permeability of the material is 0.5, it indicates that the material is **diamagnetic**.

### Final Answer:
The material is **diamagnetic**.