"Three charges, +2.5 microC, -4.8microC, and -6.3microC, are located at (-0.20m, 0.15m), (0.50m, -0.35m), and (-0.42m, -0.32m) respectively. What is the electric field at the origin?"(adsbygoogle = window.adsbygoogle || []).push({});

Using the coordinates, I found that r1^{2}= 0.0625 m^{2}, r2^{2}= 0.3725m^{2}, and r3^{2}= 0.2788m^{2}. I then plugged that into the equation E = (kq)/r^{2}, where k = 9 * 10^9.

Using that I found:

E_{1}= 3.6 * 10^5 N/C at 37º below the +x-axis.

E_{2}= 1.2 * 10^5 N/C at 35º above the -x-axis.

E_{3}= 2.0 * 10^5 N/C at 37º below the -x-axis.

Then the final components of the total Electric Field is:

E_{x}= 2.9 * 10^4 N/C

E_{y}= -2.7 * 10^5 N/C

However, the answer is 2.2 * 10^5 N/C for x, and -4.1 * 10^5 N/C for y. What am I doing wrong?

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# Homework Help: Electric field at the origin

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