An electromagnetic field is only present when ____ is flowing.

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Electric and magnetic fields come from moving charges. The magnetic part around a conductor is produced by current, and its strength is tied to how much current flows. So when current is flowing, you have an electromagnetic field in the vicinity of the conductor. A voltage alone can create an electric field (even with no current), but that’s the static electric field part and doesn’t require moving charges to exist. Resistance doesn’t create a field by itself; it just limits current. Frequency describes how fast the current changes, which affects how the electromagnetic field varies and radiates, but without any current there isn’t a magnetic field to vary.