A student says, 'A loudspeaker can be used as a microphone.'
Explain why the student is correct.
A pair of headphones contains a small loudspeaker. An alternating current with a frequency of 500 Hz passes through the coil of the loudspeaker.
State how many times each second the cone of the loudspeaker moves forwards.
Give a reason for your answer.
When the loudspeaker is used as a microphone, the potential difference it produces is much smaller than the potential difference produced by a microphone for the same sound.
Suggest one reason why.
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.