A typical copper wire might have `2xx10^(21)` free electrons in 1 cm of its length. Suppose that the dirft speed of the electrons along the wire is `0.05 cm s^(-1).` How many electrons would pass through a given cross section of the wire each second. How large would a current be flowing in the wire?

Explanation

Number per second = (number / length )(velcoity)
`=(2xx10^(21)(0.05)`
`=1xx10^(20) "electrons"//s`
`I = Q/t = (1xx10^(20)(1.6xx10^(-19)) = 16A`