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Electromagnetic coupling coefficient missing from the list
The electromagnetic coupling coefficient is missing from the list.

For the magnetic field coupling (e.g. for two coils coupled together) K = M / sqrt(L_1 * L_2)

For the electric field coupling (e.g. for two capacitive plates coupled together). I am not sure of this one between those two next equations : K = M / sqrt(C_1 * C_2). or K = M / sqrt( (C_1+M) * (C_2+M) )