Magnetic field lines around a straight current carrying conductor look like:
concentric circles
The magnetic field around a straight current carrying conductor is characterized by the formation of concentric circles around the wire. This phenomenon is explained by Ampère's Circuital Law, which states that the magnetic field generated contributes to loops around the conductor. The direction of these circles can be determined by the right-hand rule: if the thumb of your right hand points in the direction of the current, your fingers curl in the direction of the magnetic field lines. Therefore, the correct answer to the question is represented by concentric circles.
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