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Electrostatic force and magnitude problem

  1. Sep 2, 2011 #1
    In the figure, the net electrostatic force on Q1 is zero. If Q1 = +4.99 nC, determine the magnitude of Qo.


    Qo = (r0/r1)^2 * abs(q)*2cos theta

    The figure is attached, please help, I'm so lost with physics II
     

    Attached Files:

  2. jcsd
  3. Sep 2, 2011 #2

    tiny-tim

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    hi loganblacke! :smile:

    (have a theta: θ and try using the X2 icon just above the Reply box :wink:)

    forces are vectors, so you have to add them as vectors

    start by writing out the three forces as three vectors :smile:
     
  4. Sep 2, 2011 #3
    How do i determine the direction of the vectors?
     
  5. Sep 2, 2011 #4

    tiny-tim

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    each vector will point along the line between the two charges :smile:
     
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