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7.2 The motor effect

7.2 The motor effect

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Question 1

An electromagnetic buzzer contains an electromagnet and a vibrating iron reed.

a.

Which of the following changes would increase the magnetic field strength of the electromagnet?

  • Decrease the current in the coil
  • Increase the number of turns on the coil
  • Use a plastic core instead of an iron core
[1]
b.

The iron reed of the buzzer vibrates with a frequency of 12.5 Hz12.5\text{ Hz}12.5 Hz. Calculate the period of the vibration of the iron reed. Use the equation:

period=1frequency \text{period} = \frac{1}{\text{frequency}} period=frequency1​
[2]
Markscheme

7.2 The motor effect Questions

  1. GCSE
  2. /Physics
  3. /7.2 The motor effect

13 exam-style questions on AQA GCSE Physics 7.2 The motor effect, covering 7.2.1 Electromagnetism, 7.2.2 Fleming's left-hand rule (HT only), 7.2.3 Electric motors (HT only), and 7.2.4 Loudspeakers (HT only). Each one has a worked solution and a mark scheme showing where the marks go.

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