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Electricity and charge question, equilibrium, help!

  1. Aug 31, 2008 #1
    1. The problem statement, all variables and given/known data

    a charge of q is fixed on a plane at the origin of an xy coordinate system and a charge 3q is fixed at (3cm, -3cm). where must a charge of -2q be placed at rest for it to be in equilibrium so that it remains at rest? is the equilibrium stable?

    2. Relevant equations

    coulomb's law

    3. The attempt at a solution
     
  2. jcsd
  3. Sep 1, 2008 #2

    tiny-tim

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    Welcome to PF!

    Hi briteliner! Welcome to PF! :smile:

    How far have you got?

    Can you work out what line it must be on, and whether it's between or outside the charges? :smile:
     
  4. Sep 1, 2008 #3
    i don't really know where to start, all i know is that since the -2q charge is negative it should be in between the charges. i think?
     
  5. Sep 1, 2008 #4

    tiny-tim

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    Hi briteliner! :smile:

    Yes, it is repelled by both the other charges, and so it must be between them.

    ok … there's a line joining the two other charges … which side of that line must the third charge be on? :smile:
     
  6. Sep 1, 2008 #5
    why would it make a difference which side it is on?
     
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