An electromagnetic actuator controls a locking pin in an industrial safety guard. A straight section of conductor lies along a horizontal mounting plate, between the poles of a permanent magnet assembly. The magnetic field at the conductor is vertically downwards. The conventional current in the conductor is from south to north.
Give the direction of the magnetic force on the conductor.
The current is reversed and the magnetic field is unchanged. Give the direction of the magnetic force on the permanent magnet. Explain your answer.
90 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.