Physics · Oct / Nov 2021 · Paper 11 · 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. [diagram: S, bell, pivot, electromagnet, iron contact, metal] What happens when the switch S is opened?
- Airon contact: drops, bell: rings
- Biron contact: drops, bell: stops ringing
- Ciron contact: moves up, bell: rings
- Diron contact: moves up, bell: stops ringing
As printed in the paper
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Correct answer: A. iron contact: drops, bell: rings
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