Ampere rule is used to find the

Options

A. direction of current
B. direction of magnetic field
C. direction of motion of the conductor
D. magnitude of current

Answer

### Step-by-Step Solution

1. **Understanding Ampere's Rule**:
Ampere's Rule, also known as Ampere's Law, is a fundamental principle in electromagnetism that relates the integrated magnetic field around a closed loop to the electric current passing through that loop.

2. **Identifying the Options**:
The question provides several options regarding what Ampere's Rule is used to find:
- Direction of current
- Direction of magnetic field
- Direction of motion of the conductor
- Magnitude of current

3. **Evaluating Each Option**:
- **Direction of Current**: This is incorrect. Ampere's Rule does not directly determine the direction of current.
- **Direction of Magnetic Field**: This is correct. Ampere's Rule helps in determining the direction of the magnetic field produced by a current-carrying conductor.
- **Direction of Motion of the Conductor**: This is incorrect. Ampere's Rule does not provide information about the motion of the conductor.
- **Magnitude of Current**: This is also incorrect. While Ampere's Law relates the magnetic field to the current, it does not directly provide the magnitude of the current without additional information.

4. **Conclusion**:
The correct application of Ampere's Rule is to find the **direction of the magnetic field** created by a current-carrying conductor.