Richard Harrison wrote:

Incidently. nothing exceeds the speed of light, not even photons which
are supposed to be massless at rest by Einstein`s special law of
relativity. You must have current before it creates a magnetic field.
Current is not instantaneous in any case in a conductor where the
electrons set in motion do have have mass.

Hi Richard,

Perhaps it should be noted that electromagnetic waves and photons
travel neither faster nor slower than the speed of light in their
medium of travel.

73, Jim AC6XG