O-LevelPhysicsMagnetism5054/11 · Oct/Nov 2021 · Q351 Mark
The diagram shows an alarm system in which the switch S is shown closed. The top circuit is arranged so that the electromagnet is positioned over the soft iron contact. What happens when the switch S is opened?
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Adrops iron contact, rings bell
Bdrops iron contact, stops ringing
Cmoves up iron contact, rings bell
Dmoves up iron contact, stops ringing
✓ Correct answer
A: drops iron contact, rings bell
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