# Homework Help: Coulomb's Law and net electric field

1. Jan 24, 2010

### yb1013

1. The problem statement, all variables and given/known data

Two point charges q1 = -5.60 nC, and q2 = -14.0 nC are separated by 25.0 cm (see figure below).

http://www.webassign.net/yf12/21-p-031-alt.gif

(a) Find the net electric field these charges produce at point A
magnitude 10360 N/C
direction is to the right

(b) Find the net electric field these charges produce at point B.
magnitude 6068.6 N/C
direction is to the right

(c) What would be the magnitude and direction of the electric force this combination of charges would produce on a proton at A?
magnitude ______ N
direction is to the right

3. The attempt at a solution
Okay well you can see that I figured out all of the answers except for the last magnitude, it seems to be really easy but I think Im just doing something little wrong, not sure.
Thank you!

2. Jan 24, 2010

### Redbelly98

Staff Emeritus
There is a strong hint in the units of the electric field you calculated: Newtons per Coulomb.

3. Jan 24, 2010

### yb1013

I'm still not quite sure where you're going with that. I tried a couple things but I ended with the wrong answer..

4. Jan 24, 2010

### Redbelly98

Staff Emeritus
What did you try?