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Homework Help: + charged sphere and - charged sphere touch and seperate

  1. May 4, 2015 #1
    1. The problem statement, all variables and given/known data
    A small metal sphere X is charged by losing 500 electrons. An identical metal sphere Y is charged by gaining 1000 electrons. The two spheres are first put in contact with each other and then separated. If -e is the charge on an electron, what is the charge on each sphere after separation?

    Sphere X Sphere Y
    A +500 +500
    B +250 +250
    C -250 +250
    D -250 -250
    E -500 -500​

    2. Relevant equations
    n/a ???

    3. The attempt at a solution
    I think the answer is D.
    Since the metal spheres touch each other electrons will be transferred from sphere Y to sphere X so that both have the same charge.
    Is this correct? I
  2. jcsd
  3. May 4, 2015 #2


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    Science Advisor
    Homework Helper
    2017 Award

    If the unit of charge is e then I agree.
    You mean to say that there are 250 electrons on each of the two spheres.
    One electron is -e, so 250 electrons is -250e

    If the exercise is literally as you present it, the formulation is a bit unfortunate, but that's not your problem :wink:
  4. May 4, 2015 #3
    Thanks. I need to get better at my formulation anyways.....
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