A closely wound rectangular coil of has dimensions of 28.0cm by 42.0cm . The plane of the coil is rotated?

Question

A closely wound rectangular coil of 75.0 turns has dimensions of 28.0cm by 42.0cm . The plane of the coil is rotated from a position where it makes an angle of 40.0∘ with a magnetic field of 1.20T to a position perpendicular to the field. The rotation takes 0.110s . What is the average emf induced in the coil?

Answer 1

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emf= -N delta(BA)/(delta t)

delta denotes the change. The change in flux is BA(cos(theta1)-cos(theta2))

you also know the time it takes to change. substitute the values and solve for the emf.