单词：bar magnet
bar magnet的用法和样例：
例句
- If the bar magnet is simply held stationary near the coil, no current is indicated.如果磁棒单纯静止在线圈附近，就检测不到电流。
- To test the idea, one group of ten pigeons had strong little bar magnets attached to their backs.为验证这一看法，一组为十只的鸽子背上缚上了强力小磁棒。
- The magnetic state of a bar magnet or a horseshoe magnet is extremely complicated.条形磁铁或马蹄形磁铁的磁态是极其复杂的。
- Fluid iron in the planet's core acts like a huge bar magnet, creating a relatively weak magnetic field.地心处的液态铁就像一个巨大的条形磁铁，会形成相对较弱的磁场。
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