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

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Question 34

A magnetic pulse counter contains a fixed coil connected to a sensitive voltmeter. The coil stays stationary throughout. A device near the coil controls the magnetic field around it. The readings are recorded in the table.

StageWhat happens to the magnetic field around the coilVoltmeter reading
1There is no magnetic field0.00 V
2The magnetic field increases in strength+0.24 V
3The magnetic field stays at a constant strength0.00 V
a.

Explain the readings for the three stages.

[3]
b.

The device then reduces the magnetic field to zero. State what happens to the polarity of the induced potential difference and explain why.

[2]
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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