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Electron's path in uniform magnetic field? Help, please!

  1. Feb 17, 2008 #1
    1. The problem statement, all variables and given/known data
    There are three horizontal areas side by side - a completely uniform area. Areas 1 and 3, the magnetic fields are going into the page and area 2's field is going out of the page. An electron enters area 2 (the middle region). What is its path?

    2. Relevant equations

    F = qvB sin theta

    3. The attempt at a solution

    I know it's a circular path - what I was wondering was, since in regions 1,2, and 3 the magnetic fields are all perpendicular to the velocity vector of the electron (and therefore theta stays the same), does the circular path change in any way throughout the regions?
  2. jcsd
  3. Feb 17, 2008 #2


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    Staff Emeritus
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    Are you sure the angle between the magnetic field and velocity remains the same?
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