摩擦生电司空见惯,早为人们所熟悉。而“摩擦生磁”听起来近乎荒唐,但实验事实却是如此。平时稍加留心观察,就可以发现,在不用水的情况下磨刀,磨剪时,磨下的铁屑会被刀、剪的刃口所吸引,有时刃口上被吸成一大串,这还不算,更重要的是还能吸上钉书针。但这一现象不足以说明“摩擦 Friction-generating electricity is commonplace and has long been known to people. The ”friction magnetism“ sounds almost absurd, but the experimental facts are the same. Observe the observation at ordinary times, and you can find that when grinding and cutting with no water, the scraped iron scraps will be attracted by the edge of the knife and scissors, and sometimes the edge will be sucked into a large string, which is not yet More importantly, it is still possible to suck up staples. But this phenomenon is not enough to explain ”friction