铁丝可否做指南针? 提出这样的怪问题,似乎幼稚可笑!所谓“铁丝”,指的是软铁,亦称“低碳钢”.它属于软磁材料———即可以在磁场中磁化而具有磁性,当外磁场撤去后,它的磁性也就随之消失了.这就是说,铁丝不像钢丝,磁化后不具有“永磁性”.由此看来,铁丝是不能做指南针的.大 Can a wire be a compass? It seems naive and funny to ask such a strange question! The so-called “iron wire” refers to soft iron, also known as “low-carbon steel.” It belongs to a soft magnetic material—that is, it can be magnetized in a magnetic field and has Magnetic, when the external magnetic field is removed, its magnetism disappears. That is to say, unlike wire, the wire does not have “permanent magnetism” after magnetization. Therefore, it seems that the wire cannot be used as a compass.