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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.
1 Try picking up other paper clips and larger objects to determine how strong the magnet is. 2  Consider recording the length of time the paper clip stays magnetized after a certain number of rubs. 3  Experiment with different types of metal, like pins or nails, to see which one makes the strongest, longest-lasting magnet.