Nomenclature: Base plate = poster board Electrophorus = an aluminum pie pan Electrostatic pendulum = a small conductor suspended on a string next to the electrophorus Questions: 1. What is the charge of the base plate when it is rubbed with wool/fur/hair? Positive or negative? How do you know? 2. Describe the motion of charged particles ensuing when you touch the electrophorus sitting on the base plate? What kind of particles? In what direction do they move, out of the electrophorus or into electrophorus? Would the experiment work if the experimenter stood on an insulating rubber mat when touching the electrophorus? 3. What kind of interaction did you observe when lifting the electrophorus from the base plate? Attractive or repulsive? Why