An electromagnetic inspection probe is calibrated by moving a replaceable coil at constant speed across a fixed magnetic field. The field and the path of the coil are unchanged in every test.
The available coils have 80, 160 or 240 turns. The available speeds are 0.15 m/s, 0.30 m/s or 0.45 m/s.
| Turns on coil | Speed of coil in m/s\mathrm{m/s}m/s | Peak induced potential difference in V\mathrm{V}V |
|---|---|---|
| 80 | 0.15 | 0.24 |
| 80 | 0.30 | 0.48 |
| 160 | 0.15 | 0.48 |
The pattern in these results holds for every coil and speed available. Which setting is predicted to give a peak induced potential difference of 2.16 V?
240240240 turns at 0.15 m/s0.15\ \mathrm{m/s}0.15 m/s
240240240 turns at 0.45 m/s0.45\ \mathrm{m/s}0.45 m/s
808080 turns at 0.30 m/s0.30\ \mathrm{m/s}0.30 m/s
160160160 turns at 0.45 m/s0.45\ \mathrm{m/s}0.45 m/s
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.