We all know that the speed of light is faster than the speed of sound. That must be why some people appear to be bright, until they speak.
Divide the electric force constant (K sub e) by the magnetic force constant (K sub m),...
...and you get the square of a speed (m=meters, s=seconds). ...but what speed?
...taking the square root, we get...
The speed of light! This I believe was Maxwell's first clue that light was somehow related to electricty and magnetism.