A model alternator has a coil rotating in a magnetic field. The table shows the peak potential difference measured at different rotation rates.
| Rotation rate (rotations per second) | Peak potential difference (V) |
|---|---|
| 20 | 4.0 |
| 30 | 6.0 |
| 40 | 8.0 |
The coil is rotated at 50 rotations per second. Calculate the peak potential difference and the frequency of the output. Explain why the peak potential difference changes as the rotation rate increases.
92 exam-style questions on Edexcel GCSE Physics 13.1 Inducing a current, covering 13.1.1 Producing an electric current by induction, 13.1.2 Factors affecting the induced potential difference, 13.1.3 Alternators and dynamos, and 13.1.4 Microphones and loudspeakers. Each one has a worked solution and a mark scheme showing where the marks go.