A solenoid has 140 turns uniformly wrapped around a soft iron core, which has a magnetic permeability =750 Uo (mue sub-knot) diameter of 10.0m and a length of 9.00cm. What is the inductance in milli-henry (mH)? Did I set this up right? Using L=(uN^2A)/length, you get: (750*140^2*pi.005m^2*.09m)/.09m = 1.15E3 Henry = 1.15E6 Milli-Henry I think I made a conversion error somewhere. If not, why would they ask for the inductance in milli-henry, and not kilo-henry?