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7.2 The motor effect

7.2 The motor effect

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Question 3

An electromagnetic mechanism for a safety gate uses a solenoid to pull an iron plunger against a spring to open the latch.

a.

Explain why the plunger must be made of iron rather than brass.

[2]
b.

When the solenoid is activated, a force of 3.60 N3.60\text{ N}3.60 N is applied to the spring, causing it to compress by 1.80 cm1.80\text{ cm}1.80 cm. Calculate the spring constant of the spring in N/m\text{N/m}N/m.

[3]
c.

State two modifications to the solenoid or circuit that would increase the magnetic force on the plunger.

[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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