An electrical generator consists of a circular coil of wire of radius 5.00 cm and with 20 turns in the coil.  This coil rotates at a rate of 30 revolutions per second in a uniform magnetic field of strength 0.25 T.  What is the induced EMF (voltage) in this generator, averaged over  a quarter of a revolution (a 90o turn)?     9.4 V     18.8 V     24.2 V     37.6 V

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