A bit all over the place, the author assumes "It is even less well-known that the rule “nothing moves faster than the speed of light” is a consequence of the laws of electricity and magnetism" but at the same time "This is also a well-known property of electricity and magnetism" and then drops some equations.
Most people for whom this property of electricity and magnetism is well known, also know that the speed limit from general relativity comes from Maxwell's equations (which are on themselves a compilation of other previous rules).
I also dug deep into this problem a while back, but without proper physics background couldn't get too far. The speed of light comes directly from the Vacuum permeability and Vacuum permittivity, since light is an electromagnetic wave. If these were different, then the speed of light would be different. Both of these seem to be values of the behavior of vacuum in our universe (and possibly electron's [1]).
It is Maxwell's equations gives us that the speed of electromagnetic radiation needs to be c ^ 2 = 1 / (e * u) [2].
The author's assumptions were spot on for me. I am familiar enough with E&M to know the equations and roughly understand relatively but did not know where the intuition for a universal speed limit comes from.
People can disagree with your assessment, but it’s pretty sad that you write the only comment in this thread that actually engaged with the content of the linked article, and it’s downvoted.
Most people for whom this property of electricity and magnetism is well known, also know that the speed limit from general relativity comes from Maxwell's equations (which are on themselves a compilation of other previous rules).
I also dug deep into this problem a while back, but without proper physics background couldn't get too far. The speed of light comes directly from the Vacuum permeability and Vacuum permittivity, since light is an electromagnetic wave. If these were different, then the speed of light would be different. Both of these seem to be values of the behavior of vacuum in our universe (and possibly electron's [1]).
It is Maxwell's equations gives us that the speed of electromagnetic radiation needs to be c ^ 2 = 1 / (e * u) [2].
[1] https://en.wikipedia.org/wiki/Fine-structure_constant
[2] https://en.wikipedia.org/wiki/Electromagnetic_wave_equation#...