An equilateral triangle has sides of 0.16 m. Charges of -8.8, +8.0, and +1.7 µC are located at the corners of the triangle. Find the magnitude of the net electrostatic force exerted on the 1.7-µC charge.
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Definitely the wrong forum. But, all you need is Coulomb's law. Since its an equilateral triangle, r is the same for each: You can do the plug and chug.
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