help help I need your help!
2个回答
纸屑与带电体接触后带上了与带电体相同的同种电荷,而同种电荷相互排斥,所以很快弹开.
电流由正极出发,回到负极.
我们规定:正电荷定向移动的方向为电流方向
电荷的定向移动形成了电流.
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