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Homework Help: Coulomb's Law of a balloon

  1. Mar 10, 2012 #1
    Question:

    A baloon rubbed aginst denim gains a charge of -8microC. What is the electric force between the balloon and the denim when the two are separated by a distance of 5.0 cm? (Assume that the charges are located at a point.)

    Equations used:
    F electric = K q1 X q 2 / r^2


    Steps Tried:
    How can I solve this is I only have one charge?
     
  2. jcsd
  3. Mar 10, 2012 #2

    SammyS

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    From where did the balloon pick up its charge ?
     
  4. Mar 10, 2012 #3
    The denim.
     
  5. Mar 10, 2012 #4

    SammyS

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    So, what do you suppose the charge on the denim is after giving up -8 μC of charge ?
     
  6. Mar 10, 2012 #5
    Is the balloon and denim at first neutral? Then I guess the balloon would have a -8microC and the denim a +8microC. If this is correct, then I know how to solve this problem.

    Thank you for making my brain actively think!
     
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