Physics · Oct / Nov 2021 · Paper 12 · Question 35
5054Magnetic effect of a current
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?
- Adrops / rings
- Bdrops / stops ringing
- Cmoves up / rings
- Dmoves up / stops ringing
As printed in the paper
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Correct answer: A. drops / rings
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