Magnetism is caused by a curl in the field of moving electrons. How these curling fields interact is key to understanding the magnetic force. When a magnetic South pole is inverted and approaches a magnetic North pole the inversion causes the fields to line up with the same curl. This curl attracts density and as a result the two poles come together.
When a magnetic North pole is inverted and moved towards another North pole there is a repelling effect. The spinning electrons cannot simply begin spinning in the opposite direction. The spinning electrons wrap back towards the nearest South pole. This spinning field near both North poles attracts gaseous matter in the way of air and keeps the two poles apart.
When two wires are conducting current in opposite directions they are pushed apart. The current on each wire eddies off of the wire creating a curling magnetic field. When this curl is additive the air in between the wires increases. This causes the wires to be pushed apart.
When two wires are conducting current in the same direction these wires are pulled towards each other. The current on each wire eddies off the wire creating a curling electron field. When this curl cancels the electron fields from the other wire the electrons will disperse. In this electron dead environment matter does not have an easy time sticking around. The less matter there is between the two wires the closer they will come to each other.
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