Some 30 years ago I learnt in the elementary school, that if I move a permanent magnet in a coil which ends are somehow electrically closed, than I need to apply force on the magnet, because the generated current creates a magnetic field which is against the magnet's field. However if the propagation of magnetic field is the same as the speed of light, than this counter effect is not instant. What happens if the generated magnetic field arrives back to the magnet when the movement is the opposite? It still has to push when I pull the magnet, but I cannot find the reason why it happens if the change in the magnetic field is not instant. Could someone explain why this PM cannot exist?