Two point charges placed at a distance $r$ in air experience a certain force. Then the distance at which they will experience the same force in a medium of dielectric constant $K$ is

  • A

    $\frac{r}{K}$

  • B

    $Kr$

  • C

    $\frac{r}{\sqrt K}$

  • D

    $r \sqrt K$

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  • [KVPY 2018]