A technician tests a direct-current motor. A fault prevents the split-ring commutator from rotating with the coil. The brushes remain in contact with the same halves of the commutator while the coil turns.
Explain how this fault affects the turning effect after the coil has made half a revolution and what happens to the motion of the coil.
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.