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OpenStudy (anonymous):
The needle on a compass is a small magnet that detects and lines up with the magnetic field lines of the Earth. Suppose you are holding a compass and note the direction the needle is pointing. A large truck with steel sides pulls up beside you. You notice that the needle changes its position.
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OpenStudy (anonymous):
The magnetized needle is being attracted by both the Earth's magnetism and the steel in the truck.
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