AC voltage V(t) = 20 $\sin \omega t$ of frequency 50 Hz is applied to a parallel plate capacitor. The separation between the plates is 2 mm and the area is $1 \mathrm{~m}^2$. The amplitude of the oscillating displacement current for the applied AC voltage is _______. $\left[\right.$ Take $\left.\varepsilon_0=8.85 \times 10^{-12} \mathrm{~F} / \mathrm{m}\right]$