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Homework Help: Cathode Ray Tube

  1. Apr 26, 2008 #1
    1. The problem statement, all variables and given/known data
    A positively charged particle of mass 7.2 * 10^-8kg is travelling east with speed of 85 m/s. The particle enters a 0.31 T uniform magnetic field, and 2.2 * 10^-3 secounds later leaves the field one-quarter south with speed of 85 m/s. What is the charge of the particle and magnetic force?

    2. Relevant equations




    3. The attempt at a solution

    I tried but I don't have radius and charge what do I do?
  2. jcsd
  3. Apr 26, 2008 #2


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    Science Advisor

    I think because they give you a time here you can calculate the period for what would be a complete circular orbit, and then extrapolate the radius. From there, I think you should be able to solve it.
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