Question

In a long staright solenoid with cross-sectional radius `a` and number of turns per unit length `n` a current varies with a constant velocity` dotI A//s`. Find the magntidue of the eddy current field strength as a function of the distance `r` from the solenoid axis. Draw the appoximate plot of this function.

Answer 1

Correct Answer - For `r lt a, (1)/(2)rmu_(0) " nl and for " r gt a, (1)/(2)(a^(2)mu_(0)nI)/(r )`