A simple alternator has a rectangular coil that rotates between the poles of a magnet. The ends of the coil are connected to two slip rings.
Explain why the current produced by the alternator alternates in direction.
State the position of the coil when the induced potential difference is zero.
Give a reason for your answer.
Explain why the alternator uses slip rings and not a split-ring commutator.
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.