In a region of uniform magnetic induction \( B=10^{-2} \) tesla, a circular coil of radius \( 30...

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In a region of uniform magnetic induction \( B=10^{-2} \) tesla, a circular coil of radius \( 30 \mathrm{~cm} \) and resistance \( \pi^{2} \mathrm{ohm} \) is rotated about an axis which is perpendicular to the direction of \( B \) and which forms a diameter of the coil. If the coil rotates at \( 200 \mathrm{rpm} \) the amplitude of the alternating current induced in the coil is
[CBSE PMT 1990]
(a) \( 4 \pi^{2} \mathrm{~mA} \)
(b) \( 30 \mathrm{~mA} \)
(c) \( 6 \mathrm{~mA} \)
(d) \( 200 \mathrm{~mA} \)
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