Coulomb's Law and the net electric field

[yb1013]

1. Homework Statement

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 I am just doing something little wrong, not sure.
Can someone please help with what I have to do?
Thank you!

 

[rl.bhat]

Force on the proton = Net electric field at A*charge on the proton.

 

[yb1013]

okay thank you very much!