Which of the following statements correctly describes the pattern and spacing of magnetic field lines in a plane perpendicular to a long, straight, current-carrying wire?
They are concentric circles centered on the wire, with the spacing between adjacent lines increasing as the distance from the wire increases.
They are concentric circles centered on the wire, with the spacing between adjacent lines decreasing as the distance from the wire increases.
They are straight radial lines extending outwards from the wire, with the spacing between adjacent lines increasing as the distance from the wire increases.
They are straight radial lines extending outwards from the wire, with the spacing between adjacent lines remaining constant.
30 exam-style questions on CIE IGCSE Physics 4.5.3a Magnetic effect of a current and its applications. Each one has a worked solution and a mark scheme showing where the marks go.