An electric motor drives the belt of a parcel-sorting conveyor. An engineer wants the belt to move in the opposite direction. The engineer tests two arrangements.
| Arrangement | Connections to the direct current power supply | Positions of the magnet poles | Direction the belt moves |
|---|---|---|---|
| 1 | original | original | left to right |
| 2 | swapped | poles swapped | left to right |
The engineer concludes that the motor is faulty because the belt did not reverse in arrangement 2.
Explain why the results do not show that the motor is faulty. Suggest one change to arrangement 2 that would make the belt move from right to left.
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.