Question
A copper wire of length 10 m and radius $\left( {{{{{10}^{ - 2}}} \over {\sqrt \pi }}} \right)$ m has electrical resistance of 10 $\Omega$. The current density in the wire for an electric field strength of 10 (V/m) is
A copper wire of length 10 m and radius $\left( {{{{{10}^{ - 2}}} \over {\sqrt \pi }}} \right)$ m has electrical resistance of 10 $\Omega$. The current density in the wire for an electric field strength of 10 (V/m) is