A dynamo drives a resistor. The direction of rotation is reversed and the speed of rotation is increased. The magnet and external connections remain unchanged.
How does the current through the resistor change?
Its direction reverses and its mean magnitude increases.
Its direction reverses and its mean magnitude decreases.
Its direction is unchanged and its mean magnitude increases.
Its direction is unchanged and its mean magnitude decreases.
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.