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The magnetic field of a bar magnet is strongest at either pole of the magnet. It is equally strong at the north pole compared with the south pole. The force is weaker in the middle of the magnet and halfway between the pole and the center.
The magnets with the most powerful fields are possibly the heavy lift magnets used in scrap yards. An all cases, the magnetic field is created by the movement of electrons. Either the electrons spinning as is the case in permanent magnets; or as electrons carried along a wire as electric current.