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7.2 The motor effect

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Question 12

A parcel locker has an iron bolt pulled towards an electromagnet against a spring. The current in the electromagnet can be adjusted. The bolt is held in place when the current is large enough.

Which explains why reducing the current below a certain value releases the bolt?

[1]
A

Reducing the current weakens the magnetic field, allowing the spring to withdraw the bolt

B

Reducing the current leaves the magnetic field unchanged, but increases the force from the spring

C

Reducing the current reverses the magnetic field, causing the electromagnet to repel the bolt

D

Reducing the current weakens the magnetic field, so the electromagnet pushes the bolt away

Markscheme

7.2 The motor effect Questions

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

90 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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