- The compass maker permanently magnetizes the steel needle, giving it north and south magnetic poles. The Earth's magnetic south, which is located in the geographic north, attracts the needle's north pole and the needle settles in that direction. This process works because, with magnets, opposite poles attract each other.
- The Earth's magnetic field is not strong; therefore, the compass must be sensitive. If you hold a permanent magnet within two feet of a compass, it will cause the needle to change direction.
- If you store two magnets together with the poles in the same direction, both magnets will lose their magnetism over time. For the same reason, don't keep your compass too near other magnets. The proximity will either weaken or reverse the needle's magnetism.
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