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**1. Homework Statement**

A point charge of -8 µC is at the origin. What is the electric potential at

(a) (3.0m, 0),

(b) (-3.0m, 0), and

(c) (3.0m, -3.0m)?

**2. Homework Equations**

V=kq/r

**3. The Attempt at a Solution**

a & b) V=(8.99x10^9)(-8x10^-6)/3

V= -23973.3

c) V=(8.99x10^9(-8x10^-6)/6

I understand part a and b and got the correct answer. However, for part c, the only thing I am doing different is r=6 instead of 3 because the coordinates are (3.0m, -3.0m) and I am not getting the correct answer. I don't really understand. Thank you.