23What is the drift speed of the conduction electrons in a copper wire with radius r =900 mm when it has a uniform current / = 17mA? Assume that each

copper atom contributes one conduction electron to the current and that the current density is uniform across the wire's cross section. The number of electrons per unit volume, n =8.49 x 1028 m-3 \text { a. } 3.0 \times 10^{-7} \mathrm{~m} / \mathrm{s} \text { b. } 5.0 \times 10^{-6} \mathrm{~m} / \mathrm{s} \text { c. } 4.9 \times 10^{-7} \mathrm{~m} / \mathrm{s} \text { d. } 6.0 \times 10^{-9} \mathrm{~m} / \mathrm{s} \text { e. } 3.5 \times 10^{-8} \mathrm{~m} / \mathrm{s}