Which of the following pattern correctly describes the magnetic field around a long straight wire carrying current?
A. straight lines perpendicular to the wire.
B. straight lines parallel to the wire.
C. radial lines originating from the wire.
D. concentric circles centred around the wire.
Correct answer is option D. Concentric circles centred around the wire. Explanation: Concentric circles centred around the wire pattern correctly describes the magnetic field around a long straight wire carrying current.
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