A wire between the poles of a magnet is pushed upwards. The current in the wire is then reversed, and the magnet is turned round so that its poles are swapped as well. What happens to the force on the wire?
It becomes zero, because the two changes cancel the field out
It acts downwards and has the same size as it had before
It acts downwards and is twice the size it had before
It acts upwards and has the same size as it had before
39 exam-style questions on AQA GCSE Physics 7.2 The motor effect, covering 7.2.1 Electromagnetism, 7.2.2 Fleming's left-hand rule (HT only), 7.2.3 Electric motors (HT only), and 7.2.4 Loudspeakers (HT only). Each one has a worked solution and a mark scheme showing where the marks go.