1. The problem statement, all variables and given/known data Two positive point charges, A and B are 6m apart. The electric field intensity at point C, midway between the two charges is 5 N/C directed towards B and the potential at the same point is 45V. Find the magnitude of A and the magnitude of B. 2. Relevant equations E = kQ/r2 3. The attempt at a solution From what I visualize it: (+A)<---3m--->(-C)<---3m--->(+B) Using E = kQ/r2 where Q=Er2/k Q = (5 N/C)(3 m)2 / (9x109 Nm2/C2) = 5x10-9C which is the answer for A and B I suppose? But the answer key tells me that the answer in A is twice the B. How come? I'm quite confuse on how this works.