Total electric force on a particle in an equilatteral triangle

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To calculate the total electric force on the 7.00µC charge in an equilateral triangle arrangement with charges of 2.00µC and -4.00µC, Coulomb's law must be applied. The forces exerted by the other two charges on the 7.00µC charge need to be treated as vectors to find the net force. Basic trigonometry will be necessary to resolve the forces into their components. The distances between the charges are all 0.500 meters. Properly calculating these forces will yield the total electric force acting on the 7.00µC charge.
poipoipoi
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Three charged particles are located at the corners of an equilateral triangle. Calculate the total electric force on the 7.00µC charge.
The three charges are: 7.00µC, 2.00µC, and -4.00µC and they are all 0.500 meters apart. Here's a graphic of the layout:
http://gyazo.com/34786cc28a37e5b918db63a7e9d6f8c2.png

I know I have to use Coulomb's law but am having trouble coming up with the answer.
 
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poipoipoi said:
I know I have to use Coulomb's law but am having trouble coming up with the answer.

Yes, use Coulomb's law to calculate the forces. Just don't forget to treat them as vectors when calculating the net force. There's some basic trigonometry involved so it shouldn't be a problem.
 

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