A student investigates the physics of a moving-coil loudspeaker.
What type of electrical supply must be connected to the coil of the loudspeaker to produce a continuous sound wave?
Explain how this electrical supply causes the speaker cone to vibrate and produce sound.
The student designs an experiment to investigate how the force on the loudspeaker coil depends on:
The student obtains the following results:
| Magnetic flux density (T) | Current (A) | Force (N) |
|---|---|---|
| 0.15 | 0.5 | 0.06 |
| 0.30 | 1.0 | 0.24 |
| 0.45 | 1.5 | 0.54 |
Explain why these results cannot be used to determine how the current alone affects the force on the coil.
Practise AQA GCSE Physics The motor effect with exam-style questions for Foundation and Higher tier. 25 questions covering Electromagnetism, Fleming's left-hand rule (HT only), Electric motors (HT only), and Loudspeakers (physics only) (HT only), matched to the AQA GCSE Physics (8463) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.