You obviously don't understand electronics either. The current doesn't start flowing in one wire of the cable, work its way up to the load, then back down the other wire like gophers running through tunnels.
The single biggest factor in an AC line making an EM field is the fact that there is space between the two conductors. Twisting the wire creates fields from the different portions that cancel each other... for the most part. But there always remains some residual field.