The plane of coil PQRS is parallel to a uniform magnetic field - AQA - A-Level Physics - Question 23 - 2019 - Paper 2
Question 23
The plane of coil PQRS is parallel to a uniform magnetic field.
When a current / i is in the coil
A there are no magnetic forces acting on SP and QR.
B there are... show full transcript
Worked Solution & Example Answer:The plane of coil PQRS is parallel to a uniform magnetic field - AQA - A-Level Physics - Question 23 - 2019 - Paper 2
Step 1
A there are no magnetic forces acting on SP and QR.
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Answer
This statement is incorrect because when a current-carrying conductor is placed in a magnetic field, it experiences a force. However, the direction of the magnetic forces on SP and QR will oppose each other, leading to a net force of zero.
Step 2
B there are no magnetic forces acting on PQ and RS.
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Answer
This statement is also incorrect. Since PQ and RS are aligned with the current and the magnetic field, they will not experience any magnetic force either. The magnetic forces on these segments will also cancel each other out.
Step 3
C an attractive magnetic force acts between SP and QR.
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Answer
This statement is incorrect. The magnetic forces acting on SP and QR will create repulsion rather than attraction since they follow the right-hand rule in a uniform magnetic field.
Step 4
D an attractive magnetic force acts between PQ and RS.
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Answer
This is the correct answer. The currents in segments PQ and RS generate a magnetic field that results in an attractive force between them, as they are parallel conductors carrying current in the same direction.
