When a current of $0\mathrm{.}218$ A is present in a wire $20\mathrm{.}0$ m in$$length with cross$-$sectional area

$8$

$.$

$19$

$$

$10$

$$

$7$

$$

m

$2$

$,$

the electric field inside the wire is

$6\mathrm{.}50$

$$

$10$

$$

$3$

$$

V

$/$

m

$.$

What are $($a$)$ the resistance of the wire and $($b$)$ the resistivity of the material of which the wire is made?