magnet
2011-11-20 9:37 pm
圖片參考：http://imgcld.yimg.com/8/n/HA06578099/o/701111200038613873403440.jpg
Why is option 2 wrong? I think when the iron rod is placed near a magnet, the iron rod is magnetized. It then has the properties of a magnet and therefore can attract any conductor nearby. Why is it wrong?
回答 (2)
2011-11-21 12:01 am
✔ 最佳答案
You have got a wrong concept.A magnetic field only has action on ferromagnetic substances, not conductors. There are only three natural ferromagentic elements, they are iron, nickel and cobalt. Substances made from these three elements or alloys containing these elements are attracted by a bar magent.
Other substances, like coppuer, gold or silver etc, though they are conductors, are not ferromagentic and hence cannot be attracted by a bar magent.
2011-11-25 6:48 pm
couple係咩黎??@@
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20111120000051KK00386