A magnet of the usual kind (non-electro magnet), is, to put it simple, a piece of metal. Usually made out of iron. The difference between a regular piece of iron is that the iron molecules inside a magnet has been aligned so that poles (+ & -) are created. This means that if you run electricity through a regular magnet, absolutely nothing will happen apart from that; electricity running through. -when a current is run radially( from center to the edge of one pole) through a strong neodymium disc magnet, it is possible to make a homopolar motor.