Question: Magnetic fields are produced by constant electric currents. electric currents that vary siriusoidally with time. time - varying electric fields. all of the above. only

Magnetic fields are produced by
constant electric currents.
electric currents that vary siriusoidally with time.
time-varying electric fields.
all of the above.
only (a) and (b) above.
Magnetic fields are produced by constant electric

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