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Question
A circular loop has its radius increasing at a rate of 2 m/s. The loop placed perpendicular to a constant magnetic field of 0.5 wb/m2. When the radius of the loop is 4 m. the emf induced in the will be
Options:
A .   0.8 π V.
B .   8 π V.
C .   0.4 π V.
D .   Zero.
Answer: Option B

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