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Homework Help: Magnetic fields?

  1. Feb 15, 2009 #1
    1. The problem statement, all variables and given/known data
    A beam of protons is accelerated to a speed of 5.0x10^6 m/s in a particle accelerator into a uniform magnetic field. What B field perpendicular to the velocity of the proton would cancel the force of gravity and keep the beam moving exactly horizontally?

    2. Relevant equations
    B = qv/F

    3. The attempt at a solution
    I haven't made any attempts because I don't think that I was given enough information...

  2. jcsd
  3. Feb 15, 2009 #2


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    Homework Helper

    Begin with Fg = Fb (force of gravity equals magnetic force).
    Fill in the detailed formulas, then solve for what you are looking for.
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