A student replaces the alternating supply to a loudspeaker with a steady direct current that does not damage the coil.
What happens after the initial movement?
The cone vibrates continuously and produces a steady-pitched note.
The cone stays displaced and does not produce a continuous note.
The cone returns to its original position because the force reverses.
The cone alternates between two positions because the current is steady.
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.