Determine the quantity of charge on a plastic tube which has been rubbed with animal fur and gained 3.8x10^9 electrons. Determine the quantity of charge on a vinyl balloon which has been rubbed with animal fur and gained 1.7x10^12 electrons. Determine the quantity of charge on an acetate strip which has been rubbed with wool and lost 7.3x10^8 electrons. (Use 8.99 x 10^9 N·m^2/C^2 for Coulomb's constant and 1.60x10^-19 C for the charge of an electron.)