The dependence of drift velocity of electrons on electric field in a semiconductor is shown below. The semiconductor has a uniform electron concentration of $n=1 \times 10^{16} cm^{3}$ and electronic charge $q=1.6 \times 10 ^{-19}C$. If a bias of $5 V$ is applied across a $1 µm$ region of this semiconductor, the resulting current density in this region, in $kA/cm^{2} $, is _____.
