# inductance

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#### chajakedude

##### New Member
i ran across a formula and i would like to know what all of the variables are:

L = [(N^2) * μ * A] / l

im pretty sure l is length and A is area but i am confused about the rest.
any thoughts?

#### daviddoria

##### New Member
L = [(N^2) * μ * A] / l

that is what i saw from you..

there are 2 formulas for L (inductance), one is given n (number of turns per unit length), and one is given total N (total number of turns)

A is the cross sectional area of the coil

l is the length of the coil

hope that helps.
david

#### chajakedude

##### New Member
that jumbled part was supposed to be the greek symbol mu. like 10^-6 maybe?

#### stevez

##### Active Member
AL ( I can't subscript the 'L') might also be a factor that is supplied by a core manufacturer to calculate the number of turns required for a value of inductance. I use the factor when desigining toroidal inductors.

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