1. The problem statement, all variables and given/known data What is the electric field at point A in the unit of σ/ε0? 2. Relevant equations E=σ/2ε 3. The attempt at a solution I just want to make sure my thinking behind this is correct. From the center we have +5σ. To find the A what I did is subtract the other two -σ from the 5: this gives me 5-1-1 = 3. From here I just plug in: 3σ/2ε which in the units = 1.5 σ/ε Is this the correct approach?