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Homework Help: Electric Field Charge question

  1. Jun 22, 2011 #1
    1. The problem statement, all variables and given/known data

    Three charges A, B and C with charges respectively +3.2 x 10-6 C and -7.8 x 10-6 C are placed as seen in the diagram. What is the force on B because of A and C?

    2. Relevant equations


    3. The attempt at a solution

    dAB = 2.5m
    dCB= 1.5m
    k= 9.0x109 Nm2/c2

    FAB= kq1q2/r2
    = (9.0x109)(3.2x10-6)(41.4x10-6)/(2.5)2
    = 0.19 N

    FCB= kq1q2/r2
    = (9.0x109)(-7.8x10-6)(41.4x10-6)
    = -1.29 N

    from here on, I'm not really sure what I am supposed to do....
    any help would be aprreciated

  2. jcsd
  3. Jun 22, 2011 #2
    You didn't show the diagram, nor list the charge on B (I assume it's 41.6 uC) but you need to find the direction of the resultant vector.
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