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Homework Help: Distance for charge to travel through magnetic field

  1. Mar 2, 2009 #1
    1. The problem statement, all variables and given/known data
    In the diagram below, an elementary charge (either an electron or a proton, you decide) is accelerated between two charged plates into a magnetic field. The mass of the proton = 1.67x10^-27 kg. The mass of an electron = 9.11x10^-31 kg.

    D. Find the distance from the entrance point to where the charge

    2. Relevant equations

    3. The attempt at a solution

    I know that the electron is going to arc up while going through the field, but I don't know how to find how much it arcs up and therefore the point at which it exits. FYI, the field is 10cm x 10cm, and starts right after the proton moves through the hole in the plate. How do I figure it out from here? Is there a way to figure out how far up the proton will move vertically? If so, I could draw a triangle and find the distance to where it exits
  2. jcsd
  3. Mar 2, 2009 #2
    If the velocity is perpendicular to the magnetic field you can find the radius of the arc by mv / |q|B

    Not sure if this is the right approach but it might help.
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