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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 magnitude of the magnetic field is greatest: A. at the inner surface of the shell B. at the outer surface of the shell C. inside the shell near the middle D. in hollow region near the inner surface of the shell E. near the center of the hollow region. at the outer surface of the shell.