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Homework Help: Force on electron from current-carrying wire

  1. Apr 13, 2008 #1
    1. The problem statement, all variables and given/known data
    http://img236.imageshack.us/img236/5369/physxn6.png [Broken]

    2. Relevant equations
    F = IL x B
    F = QV x B

    3. The attempt at a solution

    Since I know I, L, Q, and V, I tried to work those into the two force equations... but I got no where. They dont give me B.
    Last edited by a moderator: May 3, 2017
  2. jcsd
  3. Apr 13, 2008 #2

    Shooting Star

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    Homework Helper

    Surely you can find B at a given distance from a long wire carrying a known current? Do you remember how the magnetic lines of force are around a straight wire?
  4. Apr 13, 2008 #3


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    Science Advisor

    In getting the force you need to find the B-field first, either by applying the law of Biot-Savart or Ampere's law. Of course you could also have it memorized, but that just takes all the fun out of it.. :)
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