Question regarding this and this question about mutual inductance and coupling coefficient.
I'm trying to analyse a two coil system:
It consists of two coils like in the picture with 2 cm air gap between them.
I want to find out the mutual inductance and the coupling coefficient.
I'm confused, because, from my understanding, to calculate the mutual inductance, we need to know the coupling coefficient:
But to calculate the coupling coefficient, we need to know the mutual inductance.
Experimentaly, how should I measure coupling coefficient and mutual inductance between these two planar coils?