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Find Electron Current Through Iron Wire

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Homework Statement


What electron current is driven through a 1.4-mm-diameter iron wire by a 0.070 V/m electric field? The mean time between collisions in iron is 5.2×10^−15s .
A=1.5*10^-6 m^2
ne=8.5*10^28 m^-3

Homework Equations


I know I need to use ie = neAVd, but I'm having trouble finding the drift speed.

The Attempt at a Solution


I set up ie = neAVd , as I currently know both ne and A, but the vd value is what's throwing me off. I multiplied the collision speed by the electric field strenght and got vd=3.64*10^-16m/s, which led to a final answer of ie=4.6*10^7 electrons/s. However, I was wrong and the answer is 8.4*10^18 electrons/s.
 

Answers and Replies

  • #2
gneill
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