CoachA magnet attracts iron and, hung by a thread, turns to face north. Its action concentrates at two magnetic poles, north (the end that seeks geographic north) and south: like poles repel, unlike attract. Sawing a magnet in half yields two complete magnets — no experiment has ever isolated a pole.
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Physics · 术语表
什么是 Magnet and poles？
又称： magnet · magnetic pole