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Homework Help: Magnitude of the Electric Force on q

  1. Mar 30, 2013 #1
    1. If a = 3.0 mm, b = 4.0 mm, Q1 = -60 nC, Q2 = 80 nC, and q = 30 nC in the Figure Q1,
    what is the magnitude of the electric force on q?

    2. F = kq1q2/r^2 Coulomb’s Law

    3. Answer is F=1.0N

    I'm a beginner in electrical study, i stuck on the net force.

    My steps are:
    F1=kQ1Q2/a^2 , F2= kQ2q/r^2


    Attached Files:

  2. jcsd
  3. Mar 30, 2013 #2


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    2017 Award

    Staff: Mentor

    F1 is the force between Q1 and Q2, this is not relevant here. Can you calculate the force between Q1 and q? Did you calculate F2? As both forces on q point in the same direction, just add them.
  4. Mar 30, 2013 #3
    Sure, i'm trying out more than 1 hour. Trying again.
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