Question

A parallel plate air capacitor has a capacitance of 5$\mu F$. It becomes 50 $\mu F$ when a dielectric medium occupies the entire space between its two plates.
What is the dielectric constant of the medium?

Answer 1

The capacitance of a capacitor when dielectric constant $K$ is introduced is

$C=K{C}_0$, where $C_0$ is the capacitance without dielectric constant.

So,
$50=K\times 5$
$K=10$