Hello everyone I think i set this up properly but the answer is still wrong. I tried 2 different ways, both wrong. In Figure 24-33, what is the net electric potential at point P due to the four particles, if V = 0 at infinity, q = 5.50 fC, and d = 3.00 cm? Figure 24-33 I used potential due to a group of point charges. V = The sum of all the point charges. V = 1/(4pi*Eo)(q1/r + q2/r + q3/r + q4/r); V = 1/(4pi*Eo)(5.50/.03 + 5.50/.03 + 5.50/.03 + 5.50/.03); V = 6.59x10^12 V; Which was wrong so i noticed that 2 of the charges q, where negative, so I tried: V = 1/(4pi*Eo)(5.50/.03 + 5.50/.03 + (-5.50/.03) + (-5.50/.03)); V = 0 V; Wrong again. What am I doing wrong? Is it because q = 5.50 fC? I have no idea what f stands for? is it 10^-15 or what?