Unnecessary "magnetic poles" ? If I run steady, same direction, currents through two close, slack parallel wires, I will see the two wires attract each other. If I reverse one of the currents I will see the two wires repel each other. If I now roll the wires up into coils, and place them on the same axis near to each other, and again run steady, same direction, currents through them, I will again see them attract each other. But the text books will tell me that, in the case of the coils, it is the magnetic north and south poles of the two coils which are attracting each other instead of just their parallel currents. Likewise, if I rotate one of the coils end for end, which causes its current to now be running opposite to that of the other coil, I will see the two coils repel each other. But the text books will tell me that the two coils are repelling each other because their like magnetic poles (north - north or south - south) are repelling each other, instead of their opposite parallel currents doing it. Doesn't Occam's razor suggest that we should forget the primitive, unnecessary, concept of north and south poles around current carrying coils, and, instead, acknowledge only the direct, lateral, attraction or repulsion between parallel current carrying wires, even when they are in the shape of coils?