试题与答案

真空中有两点荷Q1、Q2相距r，若将Q2的电荷量增加为原来的3倍，并将两点电荷间

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题型：选择题

题目：

真空中有两点荷Q1、Q2相距r，若将Q2的电荷量增加为原来的3倍，并将两点电荷间的距离增为原来的2倍，则在前后两种情况下，两电荷之间的作用力之比为（　　）

A．1：12

B．3：4

C．4：3

D．12：1

答案：

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