1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: ELECTROSTATICS numerical

  1. Jun 28, 2012 #1
    1. The problem statement, all variables and given/known data:
    the excess(equal in number) of electrons that must be placed on each of two small spheres spaced 3 cm apart, with force of repulsion between the spheres to be 10^-19N, is...?

    3. The attempt at a solution:
    ive calculated q from here which is 1x10^-16N..
    then used,
    from here n becomes 625 electrons. but answer in my book is 25 electrons.can someone point out my mistake?
  2. jcsd
  3. Jun 28, 2012 #2
    Your answer is correct, 25 electrons does not give 10^-19 N.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook