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Homework Help: Force between two charges

  1. Oct 26, 2016 #1
    1. The problem statement, all variables and given/known data
    I wanted to know how the charges knew their distance from each other.

    2. Relevant equations

    3. The attempt at a solution
    I think it has something to do with the electric field lines that each charge outputs.
    But I'm curious as to what these lines do once they hit another field line. Do they send information back and let the charge know that there is a like or opposite charge a some position?
    opposite = attract
    I know f=qE
    Why does the distance determine the force on a charge and not something else?
  2. jcsd
  3. Oct 26, 2016 #2


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    Homework Helper
    Gold Member

    Permittivity also plays a role in determining the force. Basically, it's the electric field that varies with distance as 1/r2. Hence, the force depends on the separation as 1/r2.
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