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Calculate the drift speed of the electro...

Calculate the drift speed of the electrons when 1A of current exists in a copper wire of cross section 2 `mm^(2)`.The number of free electrons in `1cm^(3)`of copper is `8.5xx10^(22)`.

Text Solution

Verified by Experts

We have `j="nev"_(d) " " or, v_(d)=(j)/("ne")=(i)/("Ane")`
`=(1A)/((2xx10^(6)m^(2))(8.5xx10^(22)xx10^(6)m^(-3))(1.6xx10^(-19)C))`
`=0.36"mm"//s`
We see that the drift speed is indeed small.
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