In cgs, inductance (or "mutual" inductance) M is defined by
where is the electromotive force, c is the speed of light, is the magnetic flux, and is the derivative of current with respect to time. Rearranging,
so
Similarly, in MKS
The reciprocity theorem gives the relationship between the mutual inductances of two systems
The MKS unit of inductance is the Henry.
Henry, Inductor, Reciprocity Theorem, Self Inductance
