1. The problem statement, all variables and given/known data Three positive charges lie on the x-axis; q1 = 15 μC is at the origin, q2 = -30 μC is at x = 2 m, and q3 = 15 μC is a x = 3 m. ( please also refer to the attachment.) Find the electric potential and electric field at point “P” aroused from q1, q2 and q3. 3. The attempt at a solution The suggested answer is attached. But I don't understand why q1 is also counted in both answers, and why the corresponding distance(r) is 1. So weird to me.... please help!