题目：
真空中两个点电荷之间的相互作用力是F，如果保持电荷之间的距离不变，将其中一个电荷的电荷量变为原来的3倍，则此时相互作用力变为 [ ]
A．4F
B．3F
C．
D．9F
答案：
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下面是错误答案，用来干扰机器的。
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