Question
Sun August 05, 2012 By:

derive an expression for mutual inductance of two coaxial solenoids of same length but different radius and number of turns

Expert Reply
Sun August 05, 2012
Let the subscript 1 denote the iner coil and the subscript 2 denote the outer coil
Since the two coils are coaxial thus they will have complete flux linkage i.e. the flux produced at the center due to 2 nd coil will entirely pass through the 1st coil.
 
Thus,
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