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7.2 The motor effect

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Question 20

A technician tests a moving-coil earpiece used in an intercom. The table shows two alternating current signals supplied to the earpiece.

SignalFrequency in HzMaximum size of current in A
P4000.060
Q10000.020

The technician changes the signal from P to Q.

Explain what happens to both the pitch and the loudness of the sound produced by the earpiece.

[4]
Markscheme

7.2 The motor effect Questions

  1. GCSE
  2. /Physics
  3. /7.2 The motor effect

90 exam-style questions on AQA GCSE Physics 7.2 The motor effect, covering 7.2.1 Electromagnetism, 7.2.2 Fleming's left-hand rule (HT only), 7.2.3 Electric motors (HT only), and 7.2.4 Loudspeakers (HT only). Each one has a worked solution and a mark scheme showing where the marks go.

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