1. The problem statement, all variables and given/known data Use Coulomb's law to determine the magnitude and direction of the electric field at points A and B in Fig. 16-57 due to the two positive charges (Q = 4.0 µC) shown. 3. The attempt at a solution Basically, I'm completely lost. I've applied Coulomb's law to find the magnitudes of the contributing electric fields. Can anyone help me solve this problem/ at least get started. Thanks so much, god bless.