An engineer compares generator coils that have different cross-sectional areas. Every coil has 250 turns and rotates between the same pair of magnets. A voltage sensor measures the peak induced potential difference.
Explain why each coil must be rotated at the same rate during the comparison.
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.