A point charge -2.77 n C is at the point x = 0.60 m , y = 0.80 m , and a second

Question

A point charge -2.77nC is at the point x = 0.60 m, y= 0.80 m , and a second point charge 5.6nC is at the point x = 0.60 m , y = 0

They ask you for the X and Y component of the Net Electric Field.

I found them to be

Ex: -125 N/C

Ey: 19.9 N/C

Calculate the direction of the net electric field at the origin due to these two point charges. How many degrees is it counterclockwise from the +x-axis.

I already tried arctan(Ey/Ex). I tried subtracting/adding from 180/270/360/90. I don't know what else to try.

Explanation / Answer

at origin

horizontal direction

9*10^9*(2.77*5.6*10^-18){(1/0.64)+(0.6/1) } = 3.019*10^-7 N/C in positive x direction

in vertical direction

9*10^9*(2.77*5.6*10^-18){0.798} = 1.114*10^-7 N/c in positive y direction

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