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An electron is located at the origin of the coordinates, and a second electron is brought to a position 2 Angstroms from the origin. Calculate the force between the two electrons.

I'm guessing I need to use the equation:

F(r) = (q1*q2)/(4*(pi)*e*r

^{2})

Where q1 and q2 are the magnitude of the charge of the electrons, which I'm taking to be e

^{2}or (1.602E

^{-19})

^{2}

Where pi is pi, ie 3.14159....etc

Where e is the vacuum permittivity constant, 8.854E

^{-12}

Where r is the distance between the two electrons in meters which I'm taking to be 2E

^{-10}since 1 angstrom is 10

^{-10 }meters

Anyways I do the calculations and I'm getting 5.7666E

^{-9 }Newtons but in the back of the problem book it says the answer is 7.1999E

^{-9}Newtons

It's close but I'm wondering if there's some trick to the problem or something I missed. Can someone confirm or dispute if I'm doing this correctly?