The magnetic field is…………………….around a conductor in which its magnetic effect can be felt.

Answer

### Step-by-Step Solution:

1. **Understanding the Concept of Magnetic Field**:
- A magnetic field is defined as the region around a magnet or a current-carrying conductor where magnetic forces can be experienced.

2. **Identifying the Region**:
- When a conductor carries an electric current, it generates a magnetic field around it. This magnetic field can be detected by placing a small test charge or a magnetic compass in the vicinity of the conductor.

3. **Effect of the Magnetic Field**:
- If a test charge is moved into the magnetic field created by the conductor, it will experience a force. This force is a result of the interaction between the magnetic field and the moving charge.

4. **Conclusion**:
- Therefore, we can conclude that the magnetic field is a space around a conductor in which its magnetic effect can be felt.

5. **Final Statement**:
- The complete statement to fill in the blank is: "The magnetic field is **a space around a conductor in which its magnetic effect can be felt**."