Let's see delocalized electron cloud on a surface of a metal (a piece of iron for example): When a strong Nd magnet get close the spin of these electrons allign to the magnetic field but the electrons don't move. Why? The force is not canceled out. Electrons should move and compressed in one half of the metal, build a charge (density) difference and therefore electric potential difference. It would be EMF and electric current could flow through a wire from one side to another. In other hand the object get move to the magnet. How can the electrons resist and the whole object cannot? How can the electrons hold their position?