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

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Question 13

A testing machine contains an electromagnet. A separate coil is fixed beside the electromagnet and connected to a sensitive voltmeter. The magnetic field produced by the electromagnet increases while the coil and electromagnet remain stationary. The voltmeter shows an output. Which statement explains why?

[1]
A

The magnetic field carries current directly from the electromagnet into the stationary coil.

B

Connecting the voltmeter completes the circuit and this induces a potential difference.

C

The strength of the magnetic field alone induces a potential difference across the stationary coil.

D

The changing magnetic field around the stationary coil induces a potential difference across it.

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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