Answer
$E_{}=0.324 V/m. $
Work Step by Step
$
\text { (a) Using Formula } \\ \text {, we find } E=\rho J=\frac{\rho i}{A}\\=\frac{\left[1.62 \times 10^{-8} \Omega \cdot \mathrm{m} / \mathrm{l} 100 \mathrm{~A}\right]}{5.00 \times 10^{-6} \mathrm{~m}^2}\\=0.324 \mathrm{~V} / \mathrm{m} \text {. }
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