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interesting, so you are saying it is circular logic?
Not sure that is completely correct. The speed of light can be defined as followsAs c is fundamental the vacuum permeability and the vacuum permittivity are now defined in terms of each other and the speed of light. BUT - this is not the only way they can be defined and the other methods involve other fundamental units that are not dependant (I think) on the speed of lightForce between two wires based on the separation and the current flowing - this is Ampere's LawandForce between charged particles based on charge magnitude and separation - this is Coulomb's LawThus both the vacuum permeability and the vacuum permittivity can be determined independently from speed of light.
It's possible to calculate the speed of light by knowing the electric permittivity and the magnetic permittivity. the equation is c= 1/sqrt(magnetic permeability*electric permeability) It's neat that one can calculate the speed of light by knowing those two numbers, but I have no idea how it works. I was wondering if somebody has a good conceptual explanation about how those two things control the speed of an electromagnetic wave.