Aflat, rectangular coil consisting of 60 turns measures 23.0 cm by 31.0 cm . it is in a uniform, 1.20-t, magnetic field, with the plane of the coil parallel to the field. in 0.210 s , it is rotated so that the plane of the coil is perpendicular to the field. part a what is the change in the magnetic flux through the coil due to this rotation? part b find the magnitude of the average emf induced in the coil during this rotation.