A straight wire is attached to a laboratory trolley and moves at right angles to the field lines of a uniform magnetic field. The wire stays fully within the field and is connected to a voltage sensor. The readings below are taken at equal time intervals.
| Time / s | 0.0 | 0.2 | 0.4 | 0.6 | 0.8 | 1.0 | 1.2 | 1.4 | 1.6 |
|---|---|---|---|---|---|---|---|---|---|
| Voltage / mV | 0 | +4 | +4 | +4 | 0 | 0 | -4 | -4 | -4 |
Which description of the trolley's movement is consistent with these readings?
The trolley moves in one direction at constant speed, stops, then moves in the same direction at the same speed.
The trolley moves in one direction at constant speed, then moves in the opposite direction at the same speed without stopping.
The trolley moves in one direction at constant speed, stops, then moves in the opposite direction at a greater speed.
The trolley moves in one direction at constant speed, stops, then moves in the opposite direction at the same speed.
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.