What do you mean by magnetic field lines? What would be the nature of magnetic field lines around a current carrying wire?

Explanation

### Step-by-Step Solution:

1. **Definition of Magnetic Field Lines**:
- Magnetic field lines are imaginary lines that represent the direction and strength of a magnetic field. They help visualize how the magnetic field behaves around magnets and current-carrying wires.

2. **Characteristics of Magnetic Field Lines**:
- Magnetic field lines emerge from the north pole of a magnet and enter the south pole.
- Inside the magnet, the lines go from the south pole to the north pole, completing a loop.
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