A parcel-sorting machine has a hinged gate controlled by a steel latch. While the latch is held against an electromagnet, the gate remains closed. If the latch is no longer held, a spring moves the latch away and opens the gate.
| Measurement | Distance |
|---|---|
| Distance the spring moves the latch away from the electromagnet | 4.0 cm |
| Greatest distance from which the electromagnet can pull the latch back against the spring | 3.0 cm |
Explain what happens to the gate when the current in the electromagnet is switched off and whether switching the current on again, without moving the latch by hand, returns the gate to its original position.
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.