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Magnitude of the gravitational force of attraction between the proton & electron

  1. Nov 3, 2010 #1
    1. The problem statement, all variables and given/known data

    A single proton and a single electron are fixed at a distance of 2.8 meters from each other. Find the magnitude of the electric force of attraction between them.

    i have the answer to this, it is: 2.93*10^-29

    but now it asks: Find the magnitude of the gravitational force of attraction between the proton and the electron. (Mass of a proton = 1.67 x 10-27 kg; Mass of an electron = 9.11 x 10-31 kg)

    i'm not sure where to put gravity, 6.67 * 10^-11, in the equation:

    F=k*Q*q/r2

    thank you!
     
  2. jcsd
  3. Nov 3, 2010 #2

    tiny-tim

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    welcome to pf!

    hi ali13! welcome to pf! :smile:

    (try using the X2 icon just above the Reply box :wink:)
    F = GMm/r2 :wink:
     
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