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4.2 Uses of magnetism

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Question 30
H

A microphone detects a sound. The sound is replaced by one with a higher pitch and the same loudness.

How does the current from the microphone change?

[1]
A

Its amplitude increases and its frequency stays the same

B

Both its frequency and its amplitude increase together

C

Neither changes, because the energy of the sound is the same

D

Its frequency increases and its amplitude stays the same

Markscheme

4.2 Uses of magnetism Questions

  1. GCSE
  2. /Physics
  3. /4.2 Uses of magnetism

48 exam-style questions on OCR GCSE Physics 4.2 Uses of magnetism, covering 4.2.1 The motor effect, 4.2.2 Fleming's left-hand rule, 4.2.3 The force on a current-carrying conductor, 4.2.4 The electric motor, 4.2.5 Electromagnetic induction, 4.2.6 Alternators and dynamos, 4.2.7 How transformers work, 4.2.8 Transformer turns ratio, 4.2.9 Potential differences and turns in transformers, and 4.2.10 Microphones, loudspeakers and headphones. Each one has a worked solution and a mark scheme showing where the marks go.

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