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A coil with 50 turns (radius 15cm) with a total resistance of 4 ohms is placed in a uniform magnetic field directed perpendicularly to the plane of the coil. The magnitude of this field caries with the time according to B=Asin(alpha t) where A=80*10^(-6) and alpha=50pi rads/s. What is the magnitude of the current induced in the coil at t=20ms

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