# Calculating Coulombs law

## Main Question or Discussion Point

The law I am talking about is F=K* (qa*qb / r2) I know the values of all but I have a question on the q's which represent the electrical charges...
If the charge is +2/3 do I plug in the fraction 2/3 in the q's spot? is this the numerical number I use? PLEASE HELP!!!

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Andrew Mason
Homework Helper
The law I am talking about is F=K* (qa*qb / r2) I know the values of all but I have a question on the q's which represent the electrical charges...
If the charge is +2/3 do I plug in the fraction 2/3 in the q's spot? is this the numerical number I use? PLEASE HELP!!!
Are you trying to find the coulomb force between two charges of +2e/3?

AM

Yess

Staff Emeritus
2019 Award
OK, so what unit is charge measured in? How much is e in those units? So how much then is 2/3e?

The law I am talking about is F=K* (qa*qb / r2) I know the values of all but I have a question on the q's which represent the electrical charges...
If the charge is +2/3 do I plug in the fraction 2/3 in the q's spot? is this the numerical number I use? PLEASE HELP!!!
If both of the charges are +2/3 C, then you just plug in the charges for q

F = KQQ / R^2
F = (8.98e9)(2/3)^2 / R^2

The units for charge are Coulombs.

Last edited:
ok thanks