Question

Estimate the average drift speed of conduction electrons in a copper wire of cross-sectional area `1.0xx10^(-7)m^(2)` carrying a current of `1.5xx10^(-19)`A. Assume the density of conduction electrons to be `9xx10^(28)m^(-3)`.

Answer 1

We know that `I="neA"" " vd`
Where, I is the current, n is charge density, e is charge of electron and A is cross-section area.
`V_(d)=I//"neA"`
`=1.5xx10^(19)//9xx10^(28)xx1.6xx10^(-19)xx1xx10^(-7)`
`V_(d)=10^(-3)ms^(-1)`
This is the required average drift velocity.