I've attached the questions from a worksheet. http://i2.photobucket.com/albums/y15/seiferseph/1.jpg For starters, how do i do the first one? i know Fe = q*E, but what is the charge? is it just 2 x 1.6x10^16 (because there are two protons?) for the rest, here are the answers i got, could anyone confirm any? i'm not sure about these. 2) a) Fe = 0.45 N b) E = 4.5 x 10^9 N/C 3) E = 250 N/C 4) Q = 3.0 x 10^-6 C 5) E = 5.4 x 10^10 N/C to the right Thanks again!