For electro$-$osmotic flow between two parallel plates, calculate the velocity $($in mm$/$s$)$ applicable to most part of the cross$-$section except very near the wall. Given the electric field of $10$ kV$/$cm$,$ potential of $20$ mV$,$ viscosity of $10-^3$ Pa$.$s$,$ and permittivity of $80$ x $8\mathrm{.}854$ x $10-12$ F$/$m$.$ where F $=$ coulomb$/$volt $=$ Joule$/$volt$^2$