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physics

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An electron and a proton have charges of an equal magnitude but opposite sign of 1.6 10-19 C. If the electron and proton in a hydrogen atom are separated by a distance of 5.4 10-11 m, what are the magnitude and direction of the electrostatic force exerted on the electron by the proton?

I don't really understand Coulomb's Law... HELP!!

  • physics -

    Show me your work.

  • physics -

    F=k*q1*q2/r^2
    k= 8.99^9
    q1= 1.6^-19
    q2= -1.6^-19
    r^2= 5.4^-11
    am i even close?

  • physics -

    the ^ should be e sorry...

  • physics -

    That is correct, however, you have to square r.

  • physics -

    So is -7.89e-8 my answer? Sorry I only have one more time to put it in my homework and I want to make sure I got it right this time!

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