A circular coil enclosing an area of 99 cm2 is made of 202 turns of copper wire.

Question

A circular coil enclosing an area of 99 cm2 is made of 202 turns of copper wire. The wire making up the coil has resistance of 6.0 , and the ends of the wire are connected to form a closed circuit. Initially, a 1.8 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 1.8 T and points downward through the coil. If the time required for the field to reverse directions is 0.18 s, what average current flows through the coil during that time?
A

Explanation / Answer

avg voltage = N * area * (B final - B initial) / time =

= 202 * 0.0099 * (1.8 - -1.8) / 0.18 = 40.0 volts

avg current = avg voltage / resistance = 40.0 / 6.0 = 6.67 amps

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