A circular coil enclosing an area of 160 cm^2 is made of 210 turns of copper wir

Question

A circular coil enclosing an area of 160 cm^2 is made of 210 turns of copper wire. The wire making up the coil has resistance of 9.0 Ohm, and the ends of the wire are connected to form a closed circuit. Initially, a 1.4-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 has a magnitude of 1.4 T and points downward through the coil. If the time required for the field to reverse directions is 0.20, what is the average current in the coil during that time? A

Explanation / Answer

induced emf = rate of change of magnetic field

= N A dB/dt

= (210) (160 x 10^-4) (2 x 1.4 / 0.20)

e = 47.04 Volt

I = e / R = 5.23 A

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