Which of the following statements best describes the behavior of magnetic field lines around a straight current-carrying conductor?
They form concentric circles centered on the conductor.
The magnetic field (B) around a long, straight current-carrying conductor consists of concentric circular field lines centred on the wire.
Key properties:
- The field lines are circles in planes perpendicular to the wire.
- The direction of B is given by the right-hand thumb rule: if the thumb points in the direction of current, the curled fingers show the direction of the circular field.
- Field strength B = μ₀I / (2πr), where r is the distance from the wire.
The field lines do NOT radiate straight outward (that would be an electric field from a point charge), are NOT parallel to the wire, and do NOT change direction randomly.
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