1. Calculate the charge on the pith balls for each rod/soft material combination. How many millions or billions of electrons reside on each pith ball?
2. Compare the extremely small gravitational attraction between the two pith balls with the repulsion of the electrostatic force.

Data: L= 18.7cm M= 0.04g Data table: Rod Material Distance (cm) degree Lucite/ACRYLIC mystery 0.8 1.2 ---clean rod wool 2.6 3.9 plastic 3 4.5 silk 2.6 3.9 PVC mystery 4 6.1 -Blue wool 2 3.2 plastic 4 6.1 silk 2.6 3.9 Nylon mystery 0 0 -Dark grey wool 0 0 plastic 0 0 silk 0 0 Acetate mystery 2 3.2 -white wool 0.4 0.61 plastic 4 6.1 silk 1.4 2.1 Hard rubber mystery 0 0 -black wool 2 3.2 plastic A 6.1 silk 1.62. Calculate the charge on the pith balls for each rod/soft material combination. How many millions or billions of electrons reside on each pith ball? Rod Material Angle (degree) q c Lucite/ACRYLIC mystery 1.2 ---clean rod wool 3.9 plastic 4.5 silk 3.9 PVC mystery 6.1 --Blue wool 3.2 plastic 6.1 silk 3.9 Nylon mystery 0 --Dark grey wool 0 plastic 0 silk 0 Acetate mystery 3.2 --white wool 0.61 plastic 6.1 silk 2.1 Hard rubber mystery 0 --black wool 3.2 plastic 6.1 silk 1.6