考点21 电场的力的性质
《金版教程》高考总复习首选用卷·物理(旧高考)考点21 电场的力的性质 题组一 基础小题1.(多选)下列说法中正确的是( )A.一个带电体能否看成点电荷,不是看它的尺寸大小,而是看它的形状和大小对所研究的问题的影响是否可以忽略不计B.点电荷是一种理想模型,真正的点电荷是不存在的C.点电荷就是体积和带电量都很小的带电体D.根据F=k可知,当r→0时,F→∞答案 AB解析 一个带电体能否看成点电荷,不是看它的尺寸大小,而是看它的形状和大小对所研究的问题的影响是否可以忽略不计,故A正确,C错误;点电荷是一种理想模型,实际是不存在的,故B正确;F=k适用于真空中的...
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