Photo AI
A coil P is connected to a cell and a switch - AQA - A-Level Physics - Question 27 - 2020 - Paper 2
Question 27
A coil P is connected to a cell and a switch. A closed coil Q is parallel to P and is arranged on the same axis. Which describes the force acting on Q after the swi... show full transcript
Worked Solution & Example Answer:A coil P is connected to a cell and a switch - AQA - A-Level Physics - Question 27 - 2020 - Paper 2
Step 1
Which describes the force acting on Q after the switch is closed?
Answer
When the switch is closed, current starts to flow through coil P, creating a magnetic field around it. Coil Q, being parallel to coil P and exposed to this magnetic field, will experience electromagnetic induction according to Faraday's Law. The induced current in coil Q will oppose the change in magnetic flux, resulting in a force acting on coil Q.
Initially, this induced current is short-lived as it depends on the change in current through coil P. Thus, after the switch is closed, the force on coil Q is best described as 'short-lived and directed to the right.' Therefore, the correct answer is D.