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A coil of N turns, area A rotates at n revolutions per second in a field B. What is the maximum emf?
A2 pi B A n
BB A / N
CN B A n
D2 pi N B A n
Answer & Solution
Correct answer: D. 2 pi N B A n
From e = NBA(2 pi n) sin(2 pi n t), the peak value occurs when the sine equals one.
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