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A circular coil of area $8 m^{2}$ and number of turns 20 is placed in a magnetic field of 2T with its plane perpendicular to it. It is rotated with an angular velocity of $20 rev/s$ about its natural axis. The emf induced is

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400 V

800 π V

zero

400 π V

answer is C.

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Detailed Solution

ϕ = B .A = BA \cos θ;

$θ = 90 °$

$\cos 90 = 0$

$∴ i = 0$

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