The number density of free electrons in copper is nearly 8 × 10 ^...

The formula to calculate the current through any conductor is given by

$I = nAe{v}_{d} . . . \left(1\right)$

Substitute the values of the given parameters into equation (1) and solve to calculate the required drift velocity of the electrons.

$\begin{cases}3 . 2 & = & 8 \times {10}^{28} \times 2 \times {10}^{- 6} \times 1 . 6 \times {10}^{- 19} \times {v}_{d} \\ & ⇒ & {v}_{d} = \dfrac{3 . 2}{16 \times 1 . 6 \times 1000}m{s}^{- 1} \\ & = & 125 \times {10}^{- 6}m{s}^{- 1}\end{cases}$