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2 point charges with sphere inbetween

  1. Oct 29, 2006 #1
    I am having a little trouble knowing how to approach the following question:

    Twi point charges q and -q are placed 2d apart. Show that a conducting sphere of small radius r (where r << 2d) is placed midway between the charges, show the force on each is increased by a factor of approx (1 + 16 (r^3/a^3)).

    Anyone want to help me here?

  2. jcsd
  3. Oct 30, 2006 #2
    Use the method of images on the conducting sphere, and then treat the two images as a dipole when you calculate the total force on one charge due to the other charge and the image charges.

    Also, I assume you mean d, not a, in your factor.
    Last edited: Oct 30, 2006
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