Which of the following correctly describes the magnetic field near a long straight wire? (a) The field consists of straight lines perpendicular to the wire. (b) The field consists of straight lines parallel to the wire. (c) The field consists of radial lines originating from the wire. (d) The field consists of concentric circles centered on the wire.
Option D. The magnetic lines of force are in concentric circles with the wire as the center, in a plane perpendicular to the conductor.
