Correct Answer - Option 1 : 1000 ampere

\(\begin{array}{l}
R\; = \;\rho \frac{l}{A}\; = \;2.5 \times {10^{ - 8}} \times \frac{{0.5}}{{5 \times {{10}^{ - 6}}}}\; = \;0.0025\;{\rm{\Omega }}\\
i\; = \;\frac{V}{R}\; = \;\frac{{2.5}}{{0.0025}}\; = \;1000\;ampere
\end{array}\)