A sorting machine has a permanent magnet attached to a moving carriage. A stationary coil connected to a voltmeter detects the magnet as the carriage moves towards the coil.
The table shows calibration results.
| Pole facing the coil | Speed of carriage in m/s | Peak potential difference in mV |
|---|---|---|
| north | 0.20 | +40 |
| north | 0.50 | +100 |
| south | 0.20 | −40 |
During operation, the south pole faces the coil and the carriage moves towards the coil at 0.80 m/s.
Explain how the peak potential difference will compare with the calibration results.
The carriage then stops close to the coil.
Explain the output from the coil after the carriage stops.
96 exam-style questions on AQA GCSE Physics 7.3 Induced potential, transformers and the National Grid (HT only), covering 7.3.1 Induced potential (HT only), 7.3.2 Uses of the generator effect (HT only), 7.3.3 Microphones (HT only), and 7.3.4 Transformers (HT only). Each one has a worked solution and a mark scheme showing where the marks go.