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Homework Help: Coulomb's law; vector form problem

  1. Feb 4, 2017 #1
    1. The problem statement, all variables and given/known data
    3 charges are placed like shown:

    Q1 __4cm____ Q2 ______6cm___________Q3
    Q2= 1nC
    Q3= 3nC
    Find the resultant force and its direction upon the charge Q3.

    2. Relevant equations
    k0-constant, equals to 9*10^9

    3. The attempt at a solution
    F(resultant)= 7,5-11,25-5,4 (*10^-6)= -9,15 *10^-6
  2. jcsd
  3. Feb 4, 2017 #2


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    Homework Helper
    Gold Member
    2017 Award

    Welcome to PF!

    Does the force F1,2 act on Q3?

    Be sure to include units in your answer.
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