The diagram shows a current I in a vertical square coil - AQA - A-Level Physics - Question 23 - 2020 - Paper 2
Question 23
The diagram shows a current I in a vertical square coil.
The coil can rotate about an axis OO'.
The plane of the coil is at right angles to a uniform horizontal magn... show full transcript
Worked Solution & Example Answer:The diagram shows a current I in a vertical square coil - AQA - A-Level Physics - Question 23 - 2020 - Paper 2
Step 1
A The forces on the vertical sides of the coil are equal in magnitude and opposite in direction.
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Answer
This statement is correct. According to Fleming's Left Hand Rule, the current flowing through the vertical sides of the coil experiences forces due to the magnetic field, which will be equal in magnitude and opposite in direction, resulting in no net force.
Step 2
B A non-zero couple acts on the coil.
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Answer
This statement is incorrect. While there will be forces acting on the vertical sides, they do not create a couple since the forces are balanced.
Step 3
C No forces act on the horizontal sides of the coil.
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Answer
This statement is also correct. The horizontal sides of the coil are parallel to the magnetic field, and thus no magnetic forces act on them.
Step 4
D The forces on all sides of the coil act toward the centre of the coil.
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Answer
This statement is false. The forces on the vertical sides act outward and are not directed toward the center of the coil.
