The diagram shows a square coil with its plane parallel to a uniform magnetic field - AQA - A-Level Physics - Question 22 - 2021 - Paper 2
Question 22
The diagram shows a square coil with its plane parallel to a uniform magnetic field.
There are four possible changes to the position of the coil:
- moving it to the... show full transcript
Worked Solution & Example Answer:The diagram shows a square coil with its plane parallel to a uniform magnetic field - AQA - A-Level Physics - Question 22 - 2021 - Paper 2
Step 1
moving it to the left
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Answer
Moving the coil to the left within the same magnetic field does not change the magnetic flux through the coil, hence does not induce an emf.
Step 2
moving it towards Y
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Answer
Moving the coil towards Y changes the area that the magnetic field penetrates, thus increasing the magnetic flux, resulting in an induced emf.
Step 3
rotating it about the axis Y'
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Answer
Rotating about the axis Y' does not change the area exposed to the magnetic field, therefore no induced emf occurs.
Step 4
rotating it about an axis Z
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Answer
Rotating about axis Z changes the orientation of the coil relative to the magnetic field, which can lead to a change in magnetic flux and induces an emf.
