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## Homework Statement

Three positive point charges are arranged in a triangular pattern in a plane, as shown below.

The Coulomb constant is [tex]8.98755*10^9 N · m^2/C^2.[/tex]

http://img150.imageshack.us/img150/1052/electricforceproblemqp7.th.jpg [Broken]http://g.imageshack.us/thpix.php [Broken]

Find the magnitude of the net electric force on the 6 nC charge. Answer in units of N.

## Homework Equations

[tex]F = \frac{K(qQ)} {r^2}}[/tex]

## The Attempt at a Solution

Pythagorean Theorem: [tex]\sqrt{(6)^2 + (6)^2} = 8.485[/tex]

[tex]\frac{(8.98755*10^9 N · m^2/C^2)(6*10^{-9}C)(2*10^{-9}C)} {(8.485m)^2}} = 1.498*10^{-9} N[/tex]

[tex]\frac{(8.98755*10^9 N · m^2/C^2)(6*10^{-9}C)(9*10^{-9}C)} {(8.485m)^2}} = 6.7411*10^{-9} N[/tex]

[tex]sin(45)(1.498*10^{-9} N + 6.7411*10^{-9} N) = 5.8259*10^{-9} N[/tex]

Unfortunately that's not the right answer

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