A 480-a current runs through a copper wire of diameter 2050

Question

Solve all parts of following question given below:

Question: A 4.80-A current runs through a copper wire of DIAMETER 2.050 mm and through the filament of a light bulb to which the wire is attached. Copper has 8.50 multiply.gif 1028 free electrons per cubic meter.

Part I: How many electrons pass any cross-section of the wire, or any cross-section of the filament, each second?

N = electrons per second

Part II: What is the current density in the copper wire?

J = A/m²

Part III: At what speed does a typical electron pass by any given point in the copper wire?

vd = m/s

Please write the step and answer. How do you work this question? Thanks!