# Coaxial inductance : coupling factor

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#### chromatik

##### Member level 4
coaxial inductance

Hello all,

Back from hell, I'm still searching for formulas for calculation of mutual inductance.
The situation is: one solenoid (with a magnetic core mu, with a certain number of turns, a certain number of layers and other physical parameters) is inserted inside a bigger one, with parameters too...
And I'd like to find a formula to calculate the k and M parameters...

Please, it's really important for me.

Best Regards