1.

• A. $\frac{q^4}{4\pi {\in }_0{r}^2}$
• B. $\frac{q^4}{4\pi {\in }_0{r}^2}$
• C. $\frac{q^4}{4\pi {\in }_0{r}^2}$
• D. $\frac{q^4}{4\pi {\in }_0{r}^2}$

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