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Homework Help: Magnetic field on long wire

  1. Apr 24, 2010 #1
    1. The problem statement, all variables and given/known data
    A long, straight wire carries a 15-A current along the +y axis. What is the force on an electron located instantaneously at x= 6 cm and moving with a speed of 10^6 m/s in the following directions:
    a) away from the wire along the +x axis?

    2. Relevant equations

    3. The attempt at a solution
    Like i know that the current is flowing up the y axis but like i tried using the right hand rule to find the current (my thumb points towards current and fingers curl downwards--so magnetic field is downward..is that right??
    Last edited: Apr 24, 2010
  2. jcsd
  3. Apr 24, 2010 #2
    I'm not sure what you mean by the magnetic field is "downward"

    I've uploaded a picture showing the correct direction of the magnetic field in the x-y plane.[PLAIN]http://img704.imageshack.us/img704/6974/98705090.jpg [Broken]

    so at a point along the positive x-axis, the magnetic field is directed along the negative z-axis.
    Last edited by a moderator: May 4, 2017
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