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  3. [audioFiles]2014m8s/audio_ezfj_368_20144[/audioFiles]The Compass指南针 A magne

[audioFiles]2014m8s/audio_ezfj_368_20144[/audioFiles]The Compass指南针 A magne

游客2024-09-30  17
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答案 The Compass指南针
    A magnetic compass is a device that has been used for centuries now, / and its utility in helping people find their way is undoubted. / Before technology gave us the privilege of GPS navigation systems, / the act of finding out where you are and which side is north / was carried out simply with the help of a compass. / We’ve all seen a compass at some point or the other, / and this has almost always led us to the question “How does a compass work?” / The answer to this question can be explained / through the concept of the earth’s electromagnetism. / Simply speaking, a compass is basically a small magnet / that has a needle attached on one end. / The other end of the magnet is attached to a freely moving pin. / When the compass is held out steadily, / the magnet becomes parallel with the magnetic field of the Earth, / and this causes it to point north. /
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