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Magnetism question

  1. Nov 21, 2007 #1
    [SOLVED] Magnetism question

    1. The problem statement, all variables and given/known data

    A proton, a deuteron and an alpha particle with the same kinetic energies enter a region of uniform magnetic field, moving at right angles to B. Compare the radii of their circular paths.

    2. Relevant equations

    v = qBR / m

    3. The attempt at a solution

    Using the equation above:
    K (kinetic energy) = [(q^2)(B^2)(R^2)] / 2m
    so (R^2) = (2mK) / [(q^2)(B^2)]
    From here, I don't know what to do... How do I compare the radii?
    Last edited: Nov 21, 2007
  2. jcsd
  3. Nov 21, 2007 #2
    Never mind... got it.
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