A parallel plate capacitor with air between the plates has a capacitance of $8\;pF$ . The separation between the plates is now reduced by half and the space between them is filled with a medium of dielectric constant 5. Calculate the value of capacitance of the capacitor in the second case .

Question

$\begin{array}{1 1}55\;pF \\ 80\;pF \\ 67\;pF \\ 45\;pF\end{array}$