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Homework Help: Uniform magnetic field and electric field

  1. Mar 16, 2014 #1
    1. The problem statement, all variables and given/known data
    How would you find the period of a charged particle in an uniform electric and magnetic field?
    The charged particle has velocity that is perpendicular to the magnetic and electric field (which are directed in the x-axis).

    2. Relevant equations

    3. The attempt at a solution
    In the absence of an electric field, I see that the period is given by T=2pi(m/qB). Not sure how I can find it when an electric field is present.
  2. jcsd
  3. Mar 16, 2014 #2
    Hey, when you say period, do you mean that the particle is orbiting something?
  4. Mar 16, 2014 #3
    I misunderstood the question, but I need to find the magnitude of the velocity after 'c' revolutions.
  5. Mar 16, 2014 #4


    User Avatar

    Staff: Mentor

    What does "directed in the x-axis" mean? If you were to write the three Cartesian components of, say, the electric field vector, what might it look like?
  6. Mar 16, 2014 #5
    I am lost with this question, but to go about finding the velocity at time t I think it's v=q/m (integral)[E+vxB]dt, it's just the limits of integration I'm not able to find.

    Thanks for replying.
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