Net Electric field due to 3 charges

[GayYoda]

Homework Statement

There is a 3nC charge at (-3,0), -6nC at (0,2) and 5nC at (1,0). What is the electric field at the origin (0,0)?

Homework Equations

$E = \frac{Q}{4 \pi \epsilon_0 r^2}$

The Attempt at a Solution

i think its $(\frac{1}{4 \pi \epsilon_0})(-\frac{14}{3} i - \frac{3}{2} j)$ as the charges on the x-axis are both +ve so they will repel each other?

 

[Doc Al]

Please show how you arrived at your solution. I suspect you need a numerical answer with proper units.

It is true that the field contribution at the origin from each positive charge points in a different direction.