posted by chuck .
Three point charges, A = 2.2 µC, B = 7.5 µC, and C = -3.9 µC, are located at the corners of an equilateral triangle as in the figure above. Find the magnitude and direction of the electric field at the position of the 2.2 µC charge.
Using vector addition methods, add the force on A due to B and the force on A due to C. Coulomb's Law will tell you the magnitudes of the forces between pairs.
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