breckenridgeback t1_jdyi5xf wrote
Reply to comment by Coldfriction in ELI5: Why are the Electric field and magnetic field always perpendicular to each other? by No_Victory_1611
> That is one of the questions where you say, "that is just how it is.".
It's not so much "how it is" as that it's a specific choice of coordinates. The electric field is simply the part that, in a particular choice of coordinates, does not depend on motion. Changes in coordinates to a moving observer will "mix" the electric field into the magnetic and vice-versa.
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