The magnetic field produced around a straight line wire when current flows through it is

Options

A. parallel to wire
B. perpendicular to wire
C. in form of concentric circle
D. parabolic line

Answer

To solve the question about the magnetic field produced around a straight line wire when current flows through it, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Setup**:
- We have a straight wire through which electric current is flowing. For this example, let's assume the current is flowing in the upward direction.

2. **Applying the Right-Hand Thumb Rule**:
- To determine the direction of the magnetic field around the wire, we can use the Right-Hand Thumb Rule. According to this rule, if you hold the wire with your right hand such that your thumb points in the direction of the current (upward in this case), your fingers will curl around the wire.

3. **Direction of the Magnetic Field**:
- As you curl your fingers around the wire, the direction in which your fingers point represents the direction of the magnetic field lines produced around the wire. In this case, the magnetic field will form concentric circles around the wire.

4. **Visualizing the Magnetic Field**:
- The magnetic field lines will be circular and centered on the wire. The direction of these magnetic field lines will be counterclockwise when viewed from above the wire (assuming the current is flowing upwards).

5. **Conclusion**:
- Therefore, the magnetic field produced around a straight line wire when current flows through it is in the form of concentric circles, with the direction determined by the Right-Hand Thumb Rule.

### Final Answer:
The magnetic field produced around a straight line wire when current flows through it is in the form of concentric circles.

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