A circular loop of wire with a radius of 4.0 cm is in a uniform magnetic field of magnitude 0.061 T. The plane of the loop is perpendicular to the direction of the magnetic field. In a time interval of 0.40 s, the magnetic field changes to the opposite direction with a magnitude of 0.050 T. What is the magnitude of the average emf induced in the loop?

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Q: initially

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