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Question 4 Hint for this question: see the magnetic field due to a current...
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Question 4
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Hint for this question: see the magnetic field due to a current loop in EM Module 3.
The upper and lower loops are horizontal in Figure 3 . The switch in the upper loop is initially closed. When the switch is opened, the current I in the upper loop decreases quickly to zero. While the current in the upper loop is decreasing,
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