$($a$)$ Using the data in Table $18\mathrm{.}1,$ compute the resistance of a copper wire $1$ mm $(0\mathrm{.}039$ in $.)$ in diameter and $6$ m $(236$ in$.)$ long.

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$($b$)$ What would be the current flow if the potential drop across the ends of the wire is $0\mathrm{.}06$ V $?$

A

$($c$)$ What is the current density?

$\frac{A}{m^2}$

$($d$)$ What is the magnitude of the electric field across the ends of the wire?

$\frac{V}{m}$