Gather the following equipment: A hack saw and an inexpensive bar magnet.
Follow this procedure: 1. Saw the magnet into thirds. Put the magnet together again as it was by placing the pieces side by side.
You will observe:The parts of the magnet attract each other when you replace them exactly as they were before you sawed them apart.
2. Pull the two ends away from the middle. Turn them around so that what were the north and south poles of the unsawed magnet are now point-ing inward toward the center piece. Move them toward the center piece.
You will observe: The center piece repels each end piece.
3. Take each of the three pieces of the magnet in turn and place first one end and then the other about ~ of an inch from the hack-saw blade. You will observe: In each case the hack-saw blade is attracted to the magnet. When you cut or break a magnet, the cut or broken end becomes the opposite pole to the one on the other end. A broken magnet does retain its magnetic power, but striking, dropping or vibrating a magnet, as you did when you sawed it apart, weakens it con-siderably. Magnets also become weaker when they are heated. Bear this in mind, and remember to handle and store magnets with care.
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