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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 unchanged magnet was the strongest magnet of the three magnets concluding that temperature does affect the strength of magnets. I found that the freezing and baking of the two magnets reduced the strength of the magnet by about 10 to 20%.