# In a rectangular coordinate system, a positive point charge q = 4.00 nC is placed at the point x= 0.200 m, y = 0, and an identical point charge is placed at x= -0.200 m, y = 0. Find the x and y components and the magnitude and direction of the electric field at the following points.

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Find the x and y components and the magnitude and direction of the electric field at x = .200 m, y = -.350 m.

This is what I have so far:
The angle is tan^-1 = .4/.35 = 48.8 degrees

E = (Eleftx + Erightx, Elefty + Erighty)

Erx = 0
Ery = (8.99x10^9)(4x10^-9)/(.35m)^2 = 293.55
Elx = (8.99x10^9)(4x10^-9)/(.4m)^2 = 224.75 x cos 48.8 = 148.04
Ely = Ery x sin 48.8 = 220.87

Since the charges are positive, they'll just add up to equal: (148.04, -514.42) since it's in the -y direction.

It says this answer is incorrect, and I'm not sure what I'm doing wrong. Any kind of help with step-by-step instructions would be really appreciated!
asked Jan 25, 2013 in Physics

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