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Homework Help: Charged particle within an electric field

  1. Apr 12, 2012 #1
    1. The problem statement, all variables and given/known data


    2. Relevant equations


    3. The attempt at a solution

    I can honestly say I've never been this confused by a question. At first my mind automatically went to a=qE/m since I have both charge and mass, but it became apparent that the equation was irrelevant because the velocity is constant. I thought it might be possible that I'm supposed to obtain the electric field by taking the integral of the electric potential, but I don't understand how I can get that using the information I have, and I have no sweet clue why the magnitude of the magnetic field is included.
  2. jcsd
  3. Apr 12, 2012 #2


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    Homework Helper
    Gold Member

    It means the magnetic force exactly cancels the electric force (plus the gravitational force). What's the magnetic force on the ion? :wink:
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