A) r
B) r/k
C) \[r/\sqrt{k}\]
D) \[r\sqrt{k}\]
Correct Answer: C
Solution :
\[F=F'\] or \[\frac{{{Q}_{1}}{{Q}_{2}}}{4\pi {{\varepsilon }_{0}}{{r}^{2}}}=\frac{{{Q}_{1}}{{Q}_{2}}}{4\pi {{\varepsilon }_{0}}r{{'}^{2}}K}\Rightarrow r'=\frac{r}{\sqrt{K}}\]
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