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`.`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.

Answer

A

Explanation

`ltigt = (ltepsilongt)/R=(BA)/(Rt)=((mu_(0)nI)AN)/(Rt)=(4pixx10^(-7)xx400xx0.40xx6xx10^(-4)xx10)/(1.5xx0.050)`