A straight wire is connected to a voltage sensor and moved between the poles of a horseshoe magnet. The wire is kept in the same orientation and moved through the same region at constant speed in each trial.
| Trial | Speed of wire | Direction of movement | Peak induced potential difference |
|---|---|---|---|
| 1 | 0.20 m/s | At right angles to the magnetic field lines | 1.2 mV |
| 2 | 0.40 m/s | At right angles to the magnetic field lines | 2.4 mV |
| 3 | 0.40 m/s | Along the magnetic field lines | 0.0 mV |
The wire is moved at 0.60 m/s at right angles to the magnetic field lines. Calculate the expected peak induced potential difference. Explain why movement at 0.40 m/s along the field lines gives the value in trial 3 rather than the value in trial 2.
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.