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# What is the strength of the other charge? Answered

I need help with solving this problem in physics class. I know Coulombs equation F= k(q1q2)/r^2

The force between two charges is 2 newtons. The distance between the charges is 2 x 10 ^ -4 meters. If one of the charges is 3 x 10 ^ -6 C, What is the strength of the other charge?

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## Discussions

Looks like there isn't enough information.  The equation has five variables and you only have three quantities.  The value of k is needed.

"k" is the electrostatic equivalent of "G".  This is probably a homework problem, and the student should know that number from their lectures and textbook.

here's my hint.

X= 6pe-2r

If r = 2 what does X equal?

A: X=6pe-4

if'n y'ain't got enough variable values to plug in, then the answer is based in part on numerics, and in part on unknowns

(unless the missing variable is something you're already supposed to know, like Planck's constant, or PI, or other well known constants.)

<he coughed>