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## Homework Statement

7) A uniform electric field of magnitude of E=5.5 ×10^3 N/C points in the positive x axis

direction. The electric potential at the origin (x,y)=(0,0) of the xy-coordinate system is 0V. Find the electric potential at the point (x,y)=(10.0 cm, 10.0 cm).

A) -777.8 V

B) 777.8 V

C) 550 V

D) -550 V

E) 1100 V

## Homework Equations

E = kq/r^2

V = kq/r

## The Attempt at a Solution

I thought I would have to find the charge (even though it does not mention any point charges) at (10,10).

5.5*10^3 N/C = (8.99*10^9 Nm^2/C^2)(q1)

---------------------------

(0.10)^2

q1 = 6.1179*10^-9 C

Then I thought "Oh...well I'm assuming this is the charge at (10,10)."

V = (8.99*10^9 Nm^2/C^2)(6.1179*10^-9C) / (200^.5) = 3.813 V