$(a)\;\large\frac{ke^2}{r^2}\;\hat{r}\qquad(b)\;\large\frac{ke^2}{r^3}\;\overrightarrow{r}\qquad(c)\;-\large\frac{ke^2}{r^3}\;\hat{r}\qquad(d)\;-\large\frac{ke^2}{r^3}\;\overrightarrow{r}$

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