1. The problem statement, all variables and given/known data The distance between the oxygen nucleus and each of the oxygen nuclei in an H2O molecule is 9.58*10^-11m; the angle between the H atoms is 105 degrees. Find the electric field produced by the nuclear charges (positive charges) at the point P at a distance of 1.20*10^-10m to the right of the oxygen nucleus. 2. Relevant equations The law of cosines. 3. The attempt at a solution I used the law of cosines to find the distance from the oxygen atom to the point P, but I don't know where to go from there.