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7.2 The motor effect

7.2 The motor effect

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Question 3

An electromagnetic sorting gate in a recycling facility uses an electromagnet to separate scrap iron from other metals.

a.

Which of the following modifications would increase the magnetic field strength of this electromagnet?

  • Decreasing the current in the coil
  • Replacing the iron core with a non-magnetic copper core
  • Increasing the number of turns of wire on the coil
[1]
b.

The AC power supply driving the electromagnet's control circuit causes the magnetic field to cycle at a frequency of 16 Hz16\text{ Hz}16 Hz. Calculate the period of one complete cycle of this magnetic field. 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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