I have been thinking about a bar magnet and an infinite wire in free space. The wire is positioned below the north pole of magnet and carries a current. 1) The force from the magent on the wire: Due to the magnetic field, the Lorentz force on the electrons in the wire creates a force on the wire which is directed perpendicular to the plan containing the wire and the magnet. 2) The force from the wire on the magnet: The magnetic field from the wire creates a torque on the magnet which tends to make it rotate, but is there any net force on the maget? What about Newtons third law here? Will the magnet be accelerated in the opposite direction of the acceleration of the wire? And why?