《山东高考》一轮复习教师用书2021 第7章 第1节 电场力的性质
1第1节 电场力的性质一、点电荷 电荷守恒定律 库仑定律1.点电荷 元电荷(1)点电荷:当带电体本身的大小和形状对研究的问题影响可以忽略不计时,可以将带电体视为点电荷。点电荷是一种理想化模型。(2)元电荷:把最小的电荷量叫做元电荷,用e表示,e=1.60×10-19C。所有带电体的电荷量或者等于e,或者等于e的整数倍。2.电荷守恒定律(1)内容:电荷既不能创生,也不能消失,只能从物体的一部分转移到另一部分,或者从一个物体转移到另一个物体,在转移的过程中,电荷的总量保持不变。(2)物体的带电方式:――→电子转移,电荷重新分配,遵循电荷守恒定律。(3)电荷的分配原则:两个形状、大小相同且带同种电荷...
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