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Problem abput electricity

  1. Dec 7, 2012 #1
    1. The problem statement, all variables and given/known data

    We have a charge Q and it's h metres far from the flat surface. Find the force with which acts on the Q charge by the surface
    The answer is: F=kQ2/4h2 i couldn't get it, please help me.

    2. Relevant equations

    3. The attempt at a solution
    Last edited by a moderator: Dec 7, 2012
  2. jcsd
  3. Dec 7, 2012 #2


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    Staff: Mentor

    Wow! No need to shout (Big loud font) :smile:

    Welcome to Physics Forums, shotikokobaxi.

    What formula(s) are appropriate here? Is the flat surface a conducting surface? If so, what analysis technique is appropriate for calculating the effects of an induced charge?
    Last edited by a moderator: Dec 7, 2012
  4. Dec 7, 2012 #3
    we use kulon's force F=kq2/r2 the question is to find the force with which the surface (which hasn't any charges) acts on the Q charge
  5. Dec 7, 2012 #4


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    Staff: Mentor

    Yes, that's what we call Coulomb's force law for electric charges. It is applicable, but there's a special technique which can be used for cases where one charge induces a charge in an otherwise uncharged conducting surface as you have here. Look up "the method of image charges".
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