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Calculating the induced emf - Magnetism

The magnetic field perpendicular to a circular loop of wire 17.6cm in diameter is changed from +0.510 T to -0.450 T in 117rms, where + means the field points away from an observer and - toward the observer. Calculate the induced emf.

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Area of loop A = pi*d^2/4 = 3.1416*(0.176)^2/4 = 0.02433 m^2
<br>Initial flux = BA = ...