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Gaokao Physics Practice Question

两个分别带有电荷量 $-\mathrm{Q}$ 和 $+3 \mathrm{Q}$ 的相同金属小球 (均可视为点电荷), 固定在相 距为 $\mathrm{r}$ 的两处, 它们间库仑力的大小为 $\mathrm{F}$. 两小球相互接触后将其固定距离变为 $\frac{r}{2}$, 则两 球间库仑力的大小为

  1. A.$\frac{1}{12} F$
  2. B.$\frac{3}{4} F$
  3. C.$\frac{4}{3} F$
  4. D.$\frac{1}{4} \mathrm{~F}$

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