Hello Everyone, I have wondered about this for a while but have not found a book or article that deals with this topic. Two wires carrying DC currents directed in the same direction attract each other (repel if the currents go in opposite directions). What happens if the currents in the two wires are AC instead of DC? I think it depends on the frequency and length of the wire. Some sections of the wires will attract while other sections will repel. The final effect will be determined by the net force from the various pairs of segments. What do you think? thanks!