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

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Question 21
H

A steady pressure is applied to the diaphragm of a moving-coil microphone and held constant. The microphone produces no output. Which statement explains why?

[1]
A

A steady pressure is too small to move the coil inside the magnet

B

The field of the permanent magnet is too weak to induce a potential difference

C

The coil is not part of a complete circuit while the diaphragm is still

D

The coil is not moving, so the field through the coil is not changing

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)

40 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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