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OpenStudy (anonymous):
A closely wound search coil has an area A of 4 cm^2 , 160 turns, and a resistance of 50 ohm. It is connected to a ballistic galvanometer whose resistance is 30 ohm. The small coil is placed in a uniform magnetic field B. When the coil is quickly rotated from a position where A parallel to B to one where A perpendicular B, the galvanometer indicates a charge of 4 X 10^-5 coulombs.What is the magnitude of the field?
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