A $2.50 \mathrm{~A}$ Current Is Carried by a Copper Wire of Radius

A $2.50 \mathrm{~A}$ current is carried by a copper wire of radius $1.0 \mathrm{~mm}$ . If the density of conduction electrons is $8.0 \times$ $1028 \mathrm{~m}^{-3}$ , what is the drift velocity of the conduction electrons?

A) $6.2 \times 10^{-5} \mathrm{~m} / \mathrm{s}$
B) $6.2 \times 10^{-4} \mathrm{~m} / \mathrm{s}$
C) $3.2 \times 10^{-4} \mathrm{~m} / \mathrm{s}$
D) $3.0 \times 10^{8} \mathrm{~m} / \mathrm{s}$
E) $1.6 \times 10^{-5} \mathrm{~m} / \mathrm{s}$