1. The problem statement, all variables and given/known data Point charges q and Q are positioned as shown. If q= +1.0 nC, Q = -2.0 nC, a = 3.0m, and b = 4.0m, what is the electric potential difference, Va - Vb? **The question with the diagram is also attached ** 2. Relevant equations V = ke (q/r) 3. The attempt at a solution V = (8.99x10^9)[(1.0x10^-9)/4) = 2.2475 V. The anser is 3.6V though, so I don't understand what I am doing wrong!