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## Homework Statement

Negative charge -Q is distributed uniformly around a quarter-circle of radius a that lies in the first quadrant, with the center of curvature at the origin. Find the x- and y-components of the net electric field at the origin.

## Homework Equations

V = ∫kdQ/r

E

_{radial}= -dV/dr

## The Attempt at a Solution

V = ∫kdQ/r = -kQ/r

E

_{radial}= -dV/dr = -(d/dr)(-kQ/r) = kQ(d/dr)(1/r) = kQ(-1/r

^{2}) = -kQ/r

^{2}= -kQ/a

^{2}.

I don't know how to find the x- and y-components after solving for the magnitude.