A crane in a scrapyard uses an electromagnet to move steel objects from one place to another. The electromagnet is a coil of insulated wire wound around an iron core.
Explain why an electromagnet is used instead of a permanent magnet.
The core of the electromagnet is made of iron and not of steel. Explain why.
Give one change the crane operator could make to lift heavier objects with the same electromagnet.
39 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.