The displacement current of 4.425 $\mu$A is developed in the space between the plates of parallel plate capacitor when voltage is changing at a rate of 10⁶ Vs^$-$1. The area of each plate of the capacitor is 40 cm². The distance between each plate of the capacitor is x $\times$ 10^$-$3 m. The value of x is __________.

(Permittivity of free space, E₀ = 8.85 $\times$ 10^$-$12 C² N^$-$1 m^$-$2).