A straight wire moves vertically downwards between the poles of a magnet in a linear generator, producing a positive voltage pulse. The magnet is then turned round so that its poles are swapped. The wire moves vertically downwards along the same path again, at a lower constant speed. The sensor connections and wire orientation remain unchanged.
Which pulse is recorded during the second movement?
A negative pulse with a greater peak magnitude.
A positive pulse with a smaller peak magnitude.
A negative pulse with a smaller peak magnitude.
A positive pulse with a greater peak magnitude.
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.