The dependence of drift velocity of electrons on electric field in a semiconductor is shown below. The semiconductor has a uniform electron concentration of n =1 ×10¹⁶ cm⁻³ and electronic charge q =1.6 ×10 ^-19 C. If a bias of 5V is applied across a 1μm region of this semiconductor, the resulting current density in this region, in kA/cm², is ____.