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Homework Help: Vector analysis point charges

  1. Jul 15, 2010 #1
    1. The problem statement, all variables and given/known data
    i think i may have solved this but im worried im wrong because it seemed too simple. I wouldn't bother posting too check except that its for an assignment..... the question is in the attachment- can someone please check this!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!


    2. Relevant equations



    3. The attempt at a solution


    F_1,2=(3*10^(-6)^2*9*〖10〗^9)/〖0.6〗^2
    =0.225i

    F_3,2=(3*10^(-6)^2*9*〖10〗^9)/〖0.3〗^2
    =0.9j

    F_4,2=(3*10^(-6)^2*9*10^9)/(〖0.6〗^2+〖0.3〗^2 )
    =0.18cosθ+0.18 sinθ
    θ=tan^(-1)〖0.3/0.6〗
    F_4,2=0.161i+0.080j

    ΣF=0.161i+0.225i+0.9j+0.080J
    =0.386i+0.98j
     

    Attached Files:

  2. jcsd
  3. Jul 15, 2010 #2

    Ush

    User Avatar

    that looks correct,
     
  4. Jul 15, 2010 #3
    thanks ush - cant get the other one though
     
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