Challenge 1: Which model is more accurate (bonus 10%)

Compare accuracy of the Models used in Experiment 1 and 3. In which experiment the discrepancy between measured and calculated values for the electric potential larger? Which model describe experimental data with better accuracy? What is the assumption made in both models that makes one model perform worse than another model?

Challenge 2: Fix the problem (bonus 10%)

Suggest modification to the model that performs worse to (partially) fix its shortcoming. Do not perform any calculations – describe in words.