>The major achievement of Maxwell's equations is that you can predict velocity of light This is true, but the other major achievement of Maxwell's equations wa

>The major achievement of Maxwell's equations is that you can predict velocity of light This is true, but the other major achievement of Maxwell's equations was his formulation of the displacement current: https://en.wikipedia.org/wiki/Displacement_current https://en.wikipedia.org/wiki/Displacement_current which underlies the wave equation and which "symmetrizes" the loop laws for electric and magnetic fields. This was the "missing link" between the previously known laws of electromagnetism (Ampere's law, Gauss's law, and Faraday's law) and the full theory given in Maxwell's equations.