How do electric charges create magnetic fields?

1 Answer
Jun 1, 2015

Electric charges in motion create magnetic fields.
When their motion is steady, a steady magnetic field is produced.

But if the current is unsteady, a changing magnetic field is produced, which can then induce an electric field (as per as Faraday's law), which again induces a magnetic field (as fer as Ampere-Maxwell's law) and thus, EM waves are generated.