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Homework Help: Force of attraction between proton and electron

  1. Dec 20, 2011 #1
    1. The problem statement, all variables and given/known data

    What is the force of attraction between a proton and an electron in a hydrogen atom, if they are 5.00 x 10^-11m apart?

    2. Relevant equations

    3. The attempt at a solution
    I really don't know where to go from here since i don't know the charge of the proton or electron. I just started the unit on electricity and am having a hard time with the first exercise sheet

    Thanks for any help you can give me
  2. jcsd
  3. Dec 20, 2011 #2
    you need to refer to you data book to get the charge on an electron and a proton.
    Your equation is correct
  4. Dec 20, 2011 #3
    Ok i went through it again so is the elementary charge be considered the proton charge = 1.60 x 10^-19 and electrical charge would be 1 C = 6.24 x 10^18?
  5. Dec 20, 2011 #4
    You have it....the charges are equal and are 1.6 x 10^-19C
    The separation (r) = 5 x 10^-11m
    You need the constant,k, then you can complete the calculation.
  6. Dec 20, 2011 #5
    Ok i finally got thanks

    Just one thing is confusing me and that is how the proton and the electron have the same electrical charge? I was under the impression they were different or atleast the electron had a (-) ?
  7. Dec 20, 2011 #6
    Charge is same. For convention we put a negative.
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