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Homework Help: Mass of a particle traveling in a circular path

  1. Sep 6, 2010 #1
    what is the mass of a particle which travels in a circular path with a kinetic energy of 3.2 x 10 ^-19 J moving perpendicular to a 0.200t magnetic field if it has a charge of 1.6 x10 ^-19 C and the path radius is 10 cm

    2. Relevant equations
    ke= 1/2 mv^2

    mv^2/r = qvB

    r = mv^2/qvB = mv/qB

    mv = qBr

    3. The attempt at a solution

    mv =qbr
    mv = 1.6 x10 ^-19 C x 0.200 T x 0.1 M
    mv = 3.2x 10 ^-21

    i cant figure out how to seperate the mass and velocity using ke=1/2mv^2
    any help is much appreciated
  2. jcsd
  3. Sep 7, 2010 #2


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    Homework Helper

    mv = sqrt(2*m*ke)

    Find m.