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Magnatism-Induction problem

  1. Feb 8, 2008 #1
    1. The problem statement, all variables and given/known data

    A positively charged particle moves in a circle of radius R in the plane of the page with velocity v when a magnetic field B is into the page. (a) If the magnetic field is increased, will the speed of the charged particle remain the same increase, or decrease?

    2. Relevant equations

    3. The attempt at a solution

    I just have a problem which is the direction of the velocity I should take.. this problem is number 13 in this site http://www.wellesley.edu/Physics/phyllisflemingphysics/106_p_induction.html, and it's solution is here http://www.wellesley.edu/Physics/phyllisflemingphysics/106_s_induction.html
    I didn't understood how to take the sense of v (clock wise or counterclock wise)...hope someone clarify.thanks.
  2. jcsd
  3. Feb 8, 2008 #2


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    If B is into the page, the velocity must be counterclockwise for the force to be toward the center of the circle (by the right hand rule).
  4. Feb 8, 2008 #3


    "For a particle to move in a circle, there must be a force in to the center of the circle to produce the centripetal acceleration."
    thanks pam, i didn't noticed that at first:confused:...it's easy
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