A coil is wrapped with 774 turns of wire on
the perimeter of a circular frame (of radius
61 cm). Each turn has the same area, equal
to that of the frame. A uniform magnetic
?eld is directed perpendicular to the plane of
the coil. This ?eld changes at a constant rate
from 27 mT to 41 mT in 77 ms.
What is the magnitude of the induced E in
the coil at the instant the magnetic ?eld has
a magnitude of 40 mT?
Answer in units of V


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