d
\({\text{U}} =  - {\text{K}}\frac{{{\text{z}}{{\text{e}}^2}}}{{\text{r}}}\) ; \({\text{T}} \cdot {\text{E}} =  - \frac{{\text{k}}}{2}\frac{{{\text{z}}{{\text{e}}^2}}}{{\text{r}}}\)

\(\mathrm{K.E}=\frac{\mathrm{k}}{2} \frac{\mathrm{ze}^{2}}{\mathrm{r}} .\)  Here  \(r\) decreases