A coil of 100 turns, area of 2 cm^2 and resistance of 64 Ohms is placed in a magnetic field with the plane of the coil perpend. to the field?

The coil is connected to a galvanometer that measures the total charge that flows through the coil. The coil is jerked out of the magnet field in 100 ms and a charge of 7.5 C is observed to flow through the galvanometer. What is the magnitude of the field?
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