A rectangular coil of 300 turns has an average area of average area of \( 25 \mathrm{~cm} \times...

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A rectangular coil of 300 turns has an average area of average area of \( 25 \mathrm{~cm} \times 10 \mathrm{~cm} \). The coil rotates with a speed of \( 50 \mathrm{cps} \) in a uniform magnetic field of strength \( 4 \times 10^{-2} \mathrm{~T} \) about an axis perpendicular of the field. The peak value of the induced e.m.f. is (in volt)
(A) \( 3000 \pi \)
(B) \( 30 \pi \)
(C) \( 300 \pi \)
(D) \( 3 \pi \)
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