Ok lets say we have an infinitely long magnet, with poles arranged like in the diagram. A positively charged particle is moving as shown in the diagram. Because of Lorentz forces, the particle will be accellerated towards you. Now change the frame of reference so that the particle is stopped but the magnet is moving. Due to the translational symmetry of the magnet, the magnetic field is not changing at any point. So, what is it exactly about the magnet being moved that has any effect on the stationary charged particle? <- NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN -> SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS (charged particle moving right) o -> THank you very much!