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.(adsbygoogle = window.adsbygoogle || []).push({});

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?

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Inductance of a solenoid

**Physics Forums | Science Articles, Homework Help, Discussion**