Question:

Physics 102 help please?

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A circular coil enclosing an area of 100 cm^2 of 200 turns of copper wire. the wire making up the coil has resistance of 5.0W and the ends of the wire are connected to form a close circuit. Intially, a 1.1-T uniform magnetic field points perpendicularly upward through the plane of the coil. The direction of the field then reverses so that the final magnetic field had a magnitude of 1.1 T and points downward through the coil. If the time required for the field to reverse directions is 0.10s. what average current flows through the coil during that time?

I got 8.8 A but im not sure if im correct

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  1. Faraday's Law:

    E = N d (BA) / dt

    E = ( 200 ) ( 2.2 T ) ( 100 cm^2 ) ( 1 m / 100 cm )^2 / .10 s

    E = 44 V so I = E / R = 44 V / 5 Ohms = 8.8 Amperes.

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