A coil is wrapped with 348 turns of wire on the perimeter of a circular frame (of radius 52 cm). Each turn has the same area, equal to that of the frame. A uniform magnetic field is directed perpendicular to the plane of the coil. This field changes at a constant rate from 28 mT to 49 mT in 68 ms. What is the magnitude of the induced emf in the coil at the instant the magnetic field has a magnitude of 44 mT?