A horizontal circular wire loop of radius 0.6 m
lies in a plane perpendicular to a uniform
magnetic field pointing from above into the
plane of the loop, has a magnitude of 0.19 T.
If in 0.07 s the wire is reshaped from a circle
into a square, but remains in the same plane,
what is the magnitude of the average induced
emf in the wire during this time?
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