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Mass of a particle traveling in a circular path given ke, charge and magnetic field

  1. Sep 6, 2010 #1
    1. The problem statement, all variables and given/known data
    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
     
    Last edited: Sep 6, 2010
  2. jcsd
  3. Sep 6, 2010 #2

    Delphi51

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    Homework Helper

    Re: mass of a particle traveling in a circular path given ke, charge and magnetic fie

    Write ke=1/2mv^2 as ke = ½(mv)v and replace the mv with value you found. Since you know the value of ke, you can then easily find v.
     
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