Pardon me, this is a physics question: Part 4 was, "What are the potentials at (6,2), (5,3), (7,3), and (5,4)?" Measurements are accurate to about 0.1 V.
What do the potentials at 3, 2, and 1.3 have in common with your answer in Part 4? Use the equipotential simulation as a guide to visualize the pattern and confirm with your measurement. The potentials are 3.5 and 3.6, indicating equipotentials that are distorted, compressed toward their nearest source between the charges in the same pattern. The potentials fall on a nearly perfect circle around both sources with values of 4.2 V.
The potentials are 3.5 and 3.6, indicating equipotentials that are distorted, pulling away from their nearest source between the charges in the same pattern.