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Force Between Two Dipoles

  1. Jul 23, 2011 #1
    1. The problem statement, all variables and given/known data

    Two identical dipoles, each of charge q and separation a, are a distance x apart as shown in Fig. By considering forces between pairs of charges in the different dipoles, calculate the net force between the dipoles. (a) Show that, in the limit a<<x, the force has a magnitude of 6kp^2/x^4, where p=qa is the dipole moment. (b) Is the force attractive or repulsive?

    2. Relevant equations

    F= kqq/r^2
    E= kp/r^3

    --[- +]----------[- +]--

    3. The attempt at a solution

    Not sure where to start
  2. jcsd
  3. Jul 23, 2011 #2


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    Use coulomb's law to calculate the force exerted of each of the two charges in one dipole by the other dipole.
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