Inside a wave-monitoring buoy, vertical motion drives a magnet backwards and forwards through a coil. An engineer records one calibration result.
| Number of turns | Speed of magnet relative to coil in m/s\mathrm{m/s}m/s | Peak induced potential difference in V\mathrm{V}V |
|---|---|---|
| 160 | 0.40 | 0.32 |
The coil is replaced by a coil of 280 turns. The same magnet moves over the same distance through a coil of the same area. The total resistance of the complete circuit is 14 Ω.
Calculate the speed of the magnet needed to produce a peak current of 0.080 A.
Show your working.
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.