1. The problem statement, all variables and given/known data Our lab is not online, but this is so similar to what we did. http://physics.fullerton.edu/~SAM/PDF/Lab%20Manuals/212/Individual%20Experiments/Equipotential%20Surfaces%20E6.pdf" [Broken] Instead of the ten that they set their voltage to, we set ours to 12. 2. Relevant equations Eq. 1: E=Fq , where E and F are vectors, E is the electric field, F is the force on the charge, and q is the small positive test charge. Eq. 2: [tex]\Delta[/tex]V = Ed, where [tex]\Delta[/tex]V is the potential difference, E is the electric field strength, and d is the distance between potentials. 3. The attempt at a solution I am so confused and unfortunately, I can't ask the professor at this time. I have a few questions. (1) I am not sure what q is exactly. Is that the number that the multimeter reads or is it the number 12 that we set our voltage to? (2) How can I calculate [tex]\Delta[/tex]V? (3) Do you think I should be doing different calculations for points on different equipotential lines if the q is the readout from the multimeter at those points or along the curve? Basically, I just have no idea what to calculate. I am so used to charts as our data and I'm having a hard time taking the info from the curves that we drew to actual calculations. Please help. Thanks so much.