1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Coulomb's law

  1. Nov 19, 2013 #1
    Hi, Can someone help me with this question? I understand Coulomb's law but i want to know if I am doing it right.
    So the charge of
    Q1= 2 mC
    Q2= 1 mC
    And R= 5 cm (0,05m)
    This is how i solved it.
    F= K(8,988x10^9) x (2x10^-6)x(1x10^-6) / (0,05m)^2
    F= K(8,988x10^9) x 8x10^-10
    F= 7.1904 N

    Is 7.1904 the right answer?
     
  2. jcsd
  3. Nov 19, 2013 #2
    Hi Tony Tesla...

    Welcome to PF!!

    1mC = 10-3C , not 10-6C

    Please recheck your calculations.
     
  4. Nov 19, 2013 #3
    Submultiples Multiples
    Value Symbol Name Value Symbol Name
    10−1 C dC decicoulomb 101 C daC decacoulomb
    10−2 C cC centicoulomb 102 C hC hectocoulomb
    10−3 C mC millicoulomb 103 C kC kilocoulomb
    10−6 C µC microcoulomb 106 C MC megacoulomb
    10−9 C nC nanocoulomb 109 C GC gigacoulomb
    10−12 C pC picocoulomb 1012 C TC teracoulomb
    10−15 C fC femtocoulomb 1015 C PC petacoulomb
    10−18 C aC attocoulomb 1018 C EC exacoulomb
    10−21 C zC zeptocoulomb 1021 C ZC zettacoulomb
    10−24 C yC yoctocoulomb 1024 C YC yottacoulomb
    Common multiples are in bold face.

    Source: http://en.wikipedia.org/wiki/Coulomb

    I think it is 10^-6

    Now i see it i typed Mc instead of μC
    Sorry
     
  5. Nov 19, 2013 #4
    I see now, I ment μC not mC sorry.
     
  6. Nov 19, 2013 #5
    Even then your calculations are wrong.

    Recheck...
     
  7. Nov 19, 2013 #6
    checked it 5 timed every time the answer was 7.1904 N
    After that i went to this page: http://www.endmemo.com/physics/coulomb.php
    and the answer there was also 7.1904 N
     
  8. Nov 19, 2013 #7

    ehild

    User Avatar
    Homework Helper
    Gold Member

    The solution for the force is correct if the charges are given in μC .

    ehild
     
  9. Nov 19, 2013 #8
    Thank you
     
  10. Nov 19, 2013 #9
    Yes...your solution is correct.I misread the given data.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Coulomb's law
  1. Coulombs Law (Replies: 1)

  2. Coulomb's law (Replies: 3)

  3. Coulomb's law (Replies: 1)

  4. Coulomb Law (Replies: 1)

  5. Coulomb's law (Replies: 4)

Loading...