A d $=4\mathrm{.}56$ mm diameter wire carries an electric current

of I $=12\mathrm{.}8$ A when the electric field is E $=6\mathrm{.}44102$ V$/$m

along the wire. What is the current density?

$($in A$/$m$^2)$

$16.$ A$4\mathrm{.}43105$ B$5\mathrm{.}89105$ C$7\mathrm{.}84105$

D$1\mathrm{.}04106$ E$1\mathrm{.}39106$ F$1\mathrm{.}84106$

G$2\mathrm{.}45106$ H$3\mathrm{.}26106$

$1$ pt What is the conductivity of the wire?

$($in S$/$m$)$

$17.$ A$8\mathrm{.}39106$ B$1\mathrm{.}22107$ C$1\mathrm{.}76107$

D$2\mathrm{.}56107$ E$3\mathrm{.}71107$ F$5\mathrm{.}38107$

G$7\mathrm{.}80107$ H$1\mathrm{.}13108$