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Homework Help: Particle in a uniform magnetic field

  1. Oct 11, 2015 #1
    1. The problem statement, all variables and given/known data
    A particle with charge q and kinetic energy K travels in a uniform magnetic field of magnitude B. If the particle moves in a circular path of radius R, find expressions for speed, v, and mass, m.. (Use any variable or symbol stated above as necessary.)

    2. Relevant equations
    K=1/2mv^2 F=qvB=(mv^2)/R

    3. The attempt at a solution
    2K=mv^2 ---> qvB=(2K)/R ---> (2K)/(qBR)

    Why is this incorrect?
  2. jcsd
  3. Oct 11, 2015 #2


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    2017 Award

    Staff: Mentor

    If this is supposed to be the velocity, it looks correct (if we do not include special relativity).
    Why do you think it is incorrect?
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