A rectangular loop of wire is placed perpendicular to a uniform magnetic field and then spun aro...

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A rectangular loop of wire is placed perpendicular to a uniform magnetic field and then spun around one of its sides at frequency \( f \). The induced emf is a maximum when
(A) The flux is zero
(B) The flux is a maximum
(C) The flux is half its maximum value
(D) The derivative of the flux with respect to time is zero
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