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HELP with Charges

  1. Jan 23, 2012 #1
    1. The problem statement, all variables and given/known data

    Calculate the net charge on a substance consisting of a combination of 5.4 1013 protons and 4.2 1013 electrons.

    2. Relevant equations
    I subtracted the two but i still had the wrong answer

    3. The attempt at a solution
  2. jcsd
  3. Jan 23, 2012 #2


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    Staff Emeritus
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    Homework Helper

    They probably want the charge given in Coulombs. You never really said what your answer is; is it 9.6e13 or 1.2e13?

    If you don't already know, you should look up what the charge is for just one proton -- or just one electron. The value should be given in your textbook, either in the chapter you are studying, or perhaps on the inside front or back cover.
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