Calculating Electric Field of Two Point Charges

[Zvaigzdute]

Homework Statement

A point charge of -7e-6 C is located at x = 3 m, y = -2 m. A second point charge of 12e-6 C is located at x = 1 m, y = 3 m.

Homework Equations

The Attempt at a Solution

Dq1 = sqrt(20)
Dq2 = sqrt (13)

E1 + E2= k(-7e-6)/20 + k(-7e-6)/20 = 11444.96 N/C

What am I doing wrong?

And how to find the direction ?

 

[tiny-tim]

Hi *!

(have a square-root: √ and try using the X² icon just above the Reply box )

A point charge of -7e-6 C is located at x = 3 m, y = -2 m. A second point charge of 12e-6 C is located at x = 1 m, y = 3 m.
E1 + E2= k(-7e-6)/20 + k(-7e-6)/20 = 11444.96 N/C

(I assume you're trying to find the field at (-1,0)?)

i] One of those should be +12.

ii] You must add these as vectors, so use x and y components.

 

[cupid.callin]

What is the question?