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!

Distribution of Charge

  1. Feb 18, 2005 #1
    Hello, I have a question about redistributing charges. If you have three identical spheres: A is -2 uc (microcoulombs), B is -6 uc, and C is +5 uc, touch A and B together, separate, then touch B and C together, and separate, with what charge does C end up with? I don't understand how positive and negative charges can necessarily divide their charge (as in B+C). Thank you very much!

    -Albert
     
  2. jcsd
  3. Feb 18, 2005 #2

    Galileo

    User Avatar
    Science Advisor
    Homework Helper

    If the spheres are perfect conductors, all the charge will distrubute among 2 spheres will touch eachother equally, since they are identical.
    So if two spheres touch, you can view it essentially as single conductor. When you seperate them, the total charge will be evenly distributed over the two spheres.
     
  4. Feb 18, 2005 #3

    HallsofIvy

    User Avatar
    Staff Emeritus
    Science Advisor

    Just add: two negatives will give a "larger" negative, two positives will give a larger positive, opposite signs will cancel.
    Here, A and B have a total of (-2)+ (-6)= -8 uc so after touching an separating, each will have -4 uc.

    NOW B and C have a total of (-4)+ (+5)= +1 uc so after touching and separating, each will have a charge of +0.5 uc.
     
  5. Feb 18, 2005 #4

    xanthym

    User Avatar
    Science Advisor

    Of course, the working assumption here is that all the spheres have equal radii. The answer would change if this were not the case. When 2 spherical conductors of unequal radii are "connected", the net charge distributes itself such that the Potential is equal throughout both conductors. To attain this equal Potential, the larger sphere would require greater total (surface) charge than the smaller sphere, hence producing an unequal charge distribution between the spheres.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Distribution of Charge
  1. Charge Distribution. (Replies: 3)

  2. Charge distribution (Replies: 7)

  3. Charge distribution (Replies: 2)

  4. Charge distribution (Replies: 20)

Loading...