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**1. Homework Statement**

A -10.0nC charge is located at position (x, y) = (2.0cm, 1.0cm) . At what (x, y) position(s) is the electric field - 225,000i N/C?

**2. Homework Equations**

E = (Kq/r^2)*r(hat)

**3. The Attempt at a Solution**

r = sqrt(Kq/E) = .02m = 2cm

So coordinates are (0,-2)

I tried putting this answer into mastering physics online and it says it is incorrect. I can't seem to find what I have done wrong. Any help please?