A display stand contains two permanent ring magnets on a non-magnetic guide rod. The lower ring is fixed. When the upper ring is released close to it, the upper ring moves upwards and the gap between the rings increases. A label on the stand states that the facing surfaces of the two rings are unlike poles.
Which statement explains how the movement of the upper ring shows that the label is incorrect?
Unlike poles exert no force across a gap, so the upper ring would have stayed where it was
Unlike poles attract, so the upper ring would have moved down towards the lower ring
Two permanent magnets always attract, so the upper ring should have moved towards the lower ring
Only like poles exert a magnetic force, so any movement shows that the facing poles are like
80 exam-style questions on AQA GCSE Physics 7.1 Permanent and induced magnetism, magnetic forces and fields, covering 7.1.1 Poles of a magnet and 7.1.2 Magnetic fields. Each one has a worked solution and a mark scheme showing where the marks go.