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October 1, 2014

October 1, 2014

Posted by **~christina~** on Sunday, March 30, 2008 at 9:14am.

I have no idea how to do this.

I know Coulomb's law is Fe= (|q1|q2|)/r^2 but how to find the "fraction" of electrons in one sphere..

help please

- Physics... Coulomb's law -
**Count Iblis**, Sunday, March 30, 2008 at 11:30amYou know that q1 must be minus q2 because the electrons that you tranfer from one sphere end up on the other sphere.

You then equate

(|q1|q2|)/r^2 to 1.00x10^4 N

Note that the expression (|q1|q2|)/r^2 for Coulomb force is valid MKS or CGS units not in SI units. The definition of the charge is different in SI units and you then need to include a factor

1/(4 pi epsilon_0).

Once you know the carge q1 you divide it by the charge of an electron. Divide by the total number of electrons to find the fraction.

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