Tue February 07, 2012 By:

A long solenoid with 20 turns per cm,has a small loop of area 4 cm sq. placed inside the solenoid normal to its axis.If the current carried by the solenoid changes steadily from 4A to 6A in 0.2 seconds,what is the (average)induced emf in the loop while the current is changing?

Expert Reply
Tue February 07, 2012
n=20, A= 4 cm.sq., Ii= 4A, If = 6A, Delta I = 2A, Delta t= 0.2s
Flux linked with the loop is = BA = µo nIA =µnA dI/dt
Substituting the values, we get |?|=50. 24X10^n-5 V
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