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

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Question 37

A liquid flow meter contains a small turbine. A permanent magnet is attached to the turbine and rotates past a coil that is fixed to the casing. The coil is connected to a sensitive voltmeter.

The magnet rotates at the same speed in each test.

Number of turns on the coilMaximum voltmeter reading
1000.16 V
2000.32 V
3000.48 V
a.

Explain why the voltmeter gives a reading even though the coil is stationary.

[2]
b.

A coil with 250 turns is used and the magnet rotates at the same speed. Calculate the maximum voltmeter reading.

[1]
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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