Which of the following correctly describes the magnetic field near a long straight wire?<br><b>(a) </b>The field consists of straight lines perpendicular to the wire. <br><b>(b)</b> The field consists of straight lines parallel to the wire. <br><b>(c)</b> The field consists of radial lines originating from the wire. <br><b>(d)</b> The field consists of concentric circles centered on the wire.