If the potential difference across the ends of a copper wire of \(100\) cm length is \(2\) V and the conductivity of copper is
\[
5.95\times10^7\ \mathrm{Sm^{-1}},
\]
then the current per unit area (in \(\mathrm{Am^{-2}}\)) of the conductor is
Show Hint
Current density is related to conductivity by
\[
\boxed{
J=\sigma E,
}
\]
where
\[
\boxed{
E=\frac{V}{L}.
}
\]