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 $\underline{\hspace{2cm}}$. (Permittivity of free space, E0 = 8.85 $\times$ 10 $-$ 12 C2 N $-$ 1 m $-$ 2).