What two fundamental properties of the vacuum define the speed of light according to Maxwell's equation?
Answer
Electric permittivity ($\epsilon_0$) and magnetic permeability ($\mu_0$)
The speed of light in empty space is predicted by the relationship $c = 1/\sqrt{\epsilon_0 \mu_0}$, where $\epsilon_0$ relates to the stiffness of electric fields and $\mu_0$ relates to the ease of magnetic field formation in the vacuum.
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