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So you are saying that a coil carrying 100V at 1 amp produces less EMF than a coil carrying 100A at 1V?
Electromagnetic radiation is produced by accelerating charges (typically electrons by an AC voltage) in a wire.
The strength of the radiated field is determined by the acceleration rate of the charges (determined by the frequency) and the number of moving charges (current).
The voltage is just there to move the charges in the wire and is otherwise not directly involved in generating the radiation.