The displacement current of $4.425 \mu \mathrm{~A}$ is developed in the space between the plates of parallel plate capacitor when voltage is changing at a rate of $10^6 \mathrm{Vs}^{-1}$. The area of each plate of the capacitor is $40 \mathrm{~cm}^2$. The distance between each plate of the capacitor is $x \times 10^{-3} \mathrm{~m}$. The value of $x$ is,
(Permittivity of free space, $\mathrm{E}_0=8.85 \times 10^{-12} \mathrm{C}^2 \mathrm{~N}^{-1} \mathrm{~m}^{-2}$ )