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Three equal charges 4.4 micro coulombs are located in the xy-plane, one at (0m, 63m), another at (52m, 0m), and th third at (49m, -53m). Find the magnitude of the electric field at the origin due to these three charges.

Here's how I tried to solve it:

d1 = 63m; d2 = 52m; d3 = 72.18m (derived using the distance formula)

E = kq/d^2

Enet = E1+E2+E3 = kq (1/d1^2+1/d2^2+1/d3^2)

But when I plug the numbers in, I end up with ~32 N/C as my answer but the correct answer is 20.25 N/C. What am I doing wrong? Any help would be greatly appreciated.