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A solenoid has a cross sectional area of...

A solenoid has a cross sectional area of `6.0xx10^(-4) m^(2)`, consists of `400` turns per meter, and carries a current of `0.40 A`. 10` turn coil is wrapped tightly around the circumference of the solenoid.The ends of the coil are connected to a `1.5 Omega` resistor.Suddenly, a switch is opened and the current in the solenoid dies to zero in a time `0.050 s`,Find the average current in the coil during the time.

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The correct Answer is:
`1.6xx10^(-5)A`
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