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Homework Help: Charged particles

  1. Oct 11, 2008 #1
    1. The problem statement, all variables and given/known data

    A plastic rod that has been charged to -15.0 nC touches a metal sphere. Afterward, the rod's charge is -10nC.

    Part C -
    How many charged particles were transferred?

    2. Relevant equations
    Don't know any
    e=1.6 * 10^-19

    3. The attempt at a solution

    This chapter greatly confuses me...This should be really simple and I am just being stupid...

    There is a difference of 5nC between the original charge and the current charge. However, besides knowing that I do not know what to do. There are no equations in this part of the chapter.
  2. jcsd
  3. Oct 11, 2008 #2


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    Homework Helper

    Yes this is correct.

    Now if 1 electron has a charge of 1.6 * 10^-19C. How many electrons would it take to make a chare of 5nC?

    i.e. If N is the number of electrons, and e is the charge of an electron. What N is such that Ne=5*10-9?
  4. Oct 11, 2008 #3
    That was very helpful rock.freak.
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