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Homework Help: Electrostatic Force/Coulomb's Law

  1. Aug 31, 2014 #1
    1. The problem statement, all variables and given/known data


    2. Relevant equations


    3. The attempt at a solution

    So in solving the problem, parts a) and b) were rather easy, and I believed part c) would be easy as well. I assumed:

    F=10156*(1.6E-19) which came out to 1.63E-15, but that was apparently incorrect and I'm not sure what else to try. Any help is really appreciated.
  2. jcsd
  3. Aug 31, 2014 #2


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    Welcome to PhysicsForums!

    You are doing it correctly. So there are three possibilities:

    i) there is a mistake in the online answer checker,

    ii) you just punched in the wrong values by mistake when you did your multiplication (easy to check!)

    iii) or there is a mistake in the online answer checker for part A and the E field there is actually incorrect.

    It seems to me that the most likely is i).
  4. Aug 31, 2014 #3
    Thanks for the reply. I wasn't aware that the problem had limited attempts and since posting this I have run out of attempts unfortunately. I have emailed my professor to ask him what was wrong with it and hopefully it'll get fixed. Thanks for the quick response!
  5. Aug 31, 2014 #4


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    10156 is not the same as the 10516 I saw in post 1. So the most likely is ii. Easy to check that 1.6*1.05 is not 1.63 but 1.68 indeed.

    Pity about the score, but perhaps you have learned something much more valuable....
  6. Aug 31, 2014 #5
    Honestly did not even notice that, thanks for the help. That's what it was.
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