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Need help on Electric field problem

  1. Sep 21, 2009 #1
    1. The problem statement, all variables and given/known data

    An electron (charge -e, mass m) and a positron (charge +e, mass m) revolve around their common center of mass under the influence of their attractive coulomb force. Find the speed of each particle v in terms of e, m, k and their separation r ?

    2. Relevant equations

    F= kq1q2/ r^2

    3. The attempt at a solution

    Can you guys give me a hint on this one ? Should I find the angular speed then ?
  2. jcsd
  3. Sep 22, 2009 #2


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    Science Advisor
    Homework Helper

    Hi nns91! :smile:

    Hint: use centripetal acceleration :wink:
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