1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Find Electron Current Through Iron Wire

  1. Apr 29, 2016 #1
    1. The problem statement, all variables and given/known data
    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

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

    3. 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.
     
  2. jcsd
  3. Apr 29, 2016 #2

    gneill

    User Avatar

    Staff: Mentor

Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Find Electron Current Through Iron Wire
Loading...