Well, electricity plus relativity demands magnetism (current in wire example), but don't forget E^2-B^2 and E dot B are relativistic invariants, so not for ever

Well, electricity plus relativity demands magnetism (current in wire example), but don't forget E^2-B^2 and E dot B are relativistic invariants, so not for every configuration the B field can be explained away with a Lorentz transformation.