A uniform metallic wire carries a current 2A, when 3.4 V battery is connected across it. The mass of uniform metallic wire is ${\mathrm{8.92\times 10}}^{-3}\mathrm{\hspace{0.17em}}\mathrm{kg}$, density is  ${\mathrm{8.92\times 10}}^3\mathrm{\hspace{0.17em}}\mathrm{kg}/{\mathrm{m}}^3$ and resistivity is $1.7\times {10}^{-8}\mathrm{\Omega }-\mathrm{m}$ . The length of wire is :