A circuit breaker contains an electromagnet in series with the appliance it protects. Which explains how the circuit breaker switches the current off?
A large current makes the electromagnet strong enough to pull a switch open
A large current makes the electromagnet weak enough to let a switch spring shut
A small current makes the electromagnet strong enough to pull a switch open
A small current makes the electromagnet weak enough to let a switch spring shut
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.