A fl at coil of wire has an area A, N turns, and a
Chapter , Problem 26(choose chapter or problem)
A fl at coil of wire has an area A, N turns, and a resistance R. It is situated in a magnetic fi eld, such that the normal to the coil is parallel to the magnetic fi eld. The coil is then rotated through an angle of 90, so that the normal becomes perpendicular to the magnetic fi eld. The coil has an area of 1.5 3 1023 m2 , 50 turns, and a resistance of 140 V. During the time while it is rotating, a charge of 8.5 3 1025 C fl ows in the coil. What is the magnitude of the magnetic fi eld?
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