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Homework Help: Proton moving in magnetic field

  1. Mar 26, 2009 #1
    1. The problem statement, all variables and given/known data
    At a particular instant a proton is traveling in the +z direction, with speed 4105 m/s. At the location of the proton there is a magnetic field of magnitude 0.25 T in the +x direction, due to current running in a nearby coil.
    what is the direction and magnitude of force on the proton?

    2. Relevant equations
    none i think?

    3. The attempt at a solution
    Do you use the right hand rule possibly?
  2. jcsd
  3. Mar 26, 2009 #2


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    Gold Member

    The right hand rule can give you the direction of the force, but not the magnitude.

    What equation do you know that gives the force on a charged particle of charge q moving with velocity v in a magnetic field of strength B?
  4. Mar 26, 2009 #3


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    Homework Helper

    Try to find out the formula for the force on a charged particle in a magnetic field. The direction of the field is given by the left hand rule.
  5. Mar 26, 2009 #4
    the equation is F=qvB but then using the left hand rule since it is a proton would give me negative y direction if I'm not mistaken and that is incorrect?
  6. Mar 26, 2009 #5


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    Homework Helper

    You can use either right handed screw rule or Flemming's left hand rule.
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