Hello please help with the following questions about The Millikan Oil Drop Experiment. Thx and pls show work.

1. A drop is falling in a Millikan oil drop apparatus when the electric field is off. a. What are the forces on it, regardless of its acceleration? b. If it is falling at constant velocity, what can be said about the forces on it? 2. An oil drop weighs 1.9 x 10""N. It is suspended in an electric field of 6.0 x 10' N/C. a. What is the charge on the drop? b. How many excess electrons does it carry? 3. A negatively charged oil drop weighs 8.5 x 10-"N. The drop is suspended in an 5.3 x 10 NIC electric field intensity of $3 x to tee. a. What is the charge on the drop? b. How many electrons does it carry