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7.3 Induced potential, transformers and the National Grid (HT only)

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Question 4

An underwater communication device has a coil attached to a diaphragm. The coil is in the magnetic field of a permanent magnet.

The device can operate in two modes.

ModeInput to the deviceObservation
ReceiveUnderwater sound reaches the diaphragmA varying potential difference is produced across the coil
TransmitAn alternating current is supplied to the coilThe diaphragm vibrates and produces underwater sound

Explain how the observations show which electromagnetic effect is used in each mode.

[4]
Markscheme

7.3 Induced potential, transformers and the National Grid (HT only) Questions

  1. GCSE
  2. /Physics
  3. /7.3 Induced potential, transformers and the National Grid (HT only)

96 exam-style questions on AQA GCSE Physics 7.3 Induced potential, transformers and the National Grid (HT only), covering 7.3.1 Induced potential (HT only), 7.3.2 Uses of the generator effect (HT only), 7.3.3 Microphones (HT only), and 7.3.4 Transformers (HT only). Each one has a worked solution and a mark scheme showing where the marks go.

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