A trolley carrying a magnet moves towards and through a fixed coil. The coil is either connected to a resistor, making a complete circuit, or left open. In both trials, the trolley enters the coil at 2.4 m/s. The table shows its speed as it leaves the coil.
| Circuit | Speed as trolley leaves coil (m/s) |
|---|---|
| Connected to resistor | 1.8 |
| Left open | 2.4 |
Explain the difference between the two exit speeds shown in the table.
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.