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A flat coil of wire has an area A, N turns, and a resistance R. It...

A flat coil of wire has an area A, N turns, and a resistance R. It is situated in a magnetic field, such that the normal to the coil is parallel to the magnetic field. The coil is then rotated through an angle of 90˚, so that the normal becomes perpendicular to the magnetic field. The coil has an area of 1.5 × 10-3 m2, 50 turns, and a resistance of 190 Ω. During the time while it is rotating, a charge of 8.9 × 10-5 C flows in the coil. What is the magnitude of the magnetic field?

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