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A coil of 1000 turns and area $10\ \text{cm}^2$ rotates about an axis perpendicular to a uniform field $B = 0.02$ T at 50 rev/s. The maximum EMF induced is approximately:
A628 V
B0.63 V
C62.8 V
D6.28 V
Answer & Solution
Correct answer: D. 6.28 V
$\omega = 2\pi \times 50 = 100\pi$ rad/s. Peak EMF $= N A B \omega = 1000 \times (10\times10^{-4}) \times 0.02 \times 100\pi = 1000 \times 10^{-3} \times 0.02 \times 314.16 = 6.28$ V.
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