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.
(1)
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, (2)
so
(3)
Similarly, in MKS
(4)
(5)
(6)
The reciprocity theorem gives the relationship between the mutual inductances of two systems
(7)
The MKS unit of inductance is the Henry.
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