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Homework Help: Electrostatics problem

  1. Nov 25, 2006 #1
    Particles of charge Q1 = +62 µC, Q2 = +45 µC, and Q3 = -80 µC are placed in a line (Fig. 16-37). The center one is 0.35 m from each of the others. Calculate the net force on each charge due to the other two.

    16-37alt.gif

    I have found the forces between Q1 - Q2, Q2 - Q3, and Q1 - Q3.

    Here is my work for Q1 - Q2:

    [tex]F = kq1q2/r^2

    F = (8.99e9)(62e6)(45e6)/(.35)^2

    F = 2.05e26 N

    [/tex]

    I entered this Force value in for Q1

    Force on Q1:
    Magnitude
    _______ N
    Direction
    right
    up
    left
    down

    and it marked me wrong, though I got the direction right. Am I not using the right force for Q1 or something? I am quite confused with this, any help would be very appreciated, thank you.
     
  2. jcsd
  3. Nov 25, 2006 #2
    I realized I used µ wrong, and that it is [tex]10^-6[/tex] but I am still getting the wrong answer. I am veryy lost and confused. Maybe I should try doing this tomorrow instead of at 1 AM. but any help is appreciated.
     
  4. Nov 26, 2006 #3
    I am bumping this so someone can pelaseee help me with this question. I am unsure of which force value applies to which particle...for Q1 it says the force is 114 N. I got like...208 N for the Force between Q1 and Q2. Please someone help!
     
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