十万个为什么·科学阅读30篇(6)
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How Do Magnets Stick to Some Metals?
磁铁为什么会吸住某些金属?
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Magnets have two ends: north and south poles.磁铁有两端:北极和南极。
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They create an invisible force field around them.它们周围会产生看不见的力场。
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Iron, nickel and cobalt feel this magnetic pull.铁、镍和钴能感受到这种磁力吸引。
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Their atoms can line up with the magnet’s field.这些金属的原子可与磁铁的磁场方向对齐。
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Other metals like aluminum or copper do not react.铝、铜等其他金属则不会产生反应。
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Opposite poles attract; same poles push apart.异极相吸,同极相斥。
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Some magnets stay strong for years.有些磁铁能长期保持强磁性。
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Heat or hard drops can weaken them.高温或剧烈撞击会削弱其磁性。