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Physics 30: Assignment 13 Part Two: The Millikan Experiment 1. In his experiment, why was Millikan unable to use water to make the droplets? (1 mark) 2. Millikan's oil drop experiment resulted in the determination of the charge on the electron. Describe two other quantities that were determined for subatomic particles using the results of the experiment. (2 marks) 3. During a Millikan oil-drop experiment a student recorded the weight of five different droplets. She also recorded the electric field intensity needed to hold each droplet stationary between the horizontal charged plates Droplet Weight Electric Field Strength (x 10-14 N) (x 105 N/C) 1.70 1.10 5.60 3.50 5.10 3.80 2.90 1.80 4.00 2.50 a. Graph the recorded data. (5 marks)Physics 30: Assignment 13 6 b. Using only the graph, determine elementary charge. (1 mark) 4. In a Millikan-type experiment, two horizontal charged plates are 2.5 cm apart. A latex sphere of 1.3 x 10-15 kg remains stationary between the plates when the potential difference between the plates is 400 V. The upper plate is charged positive. + + +++++++++ a. What is the type of charge on the sphere? (1 mark) b. What is the electric field intensity between the plates? (2 marks) c. What is the charge on the sphere? (3 marks)Physics 30: Assignment 13 7 d. How many excess elementary charges are on the sphere? (2 marks) 5. Two large, horizontal charged plates are separated by 0.050 m. A small plastic sphere is stationary and suspended between them. The sphere is experiencing an electric force of 4.5 x 10-15 N. a. What is the mass of the sphere? (2 marks) b. If the sphere has four excess electrons, what is the potential difference between the plates? (3 marks)Physics 30: Assignment 13 B 6. A 1.50x 10-"* kg oil drop accelerates downwards at a rate of 1.80 m/s* when placed between two horizontal plates that are 9.40 cm apart. The potential difference between the two plates is 980 V. Determine the magnitude of the change on the oil drop. Show all work. (5 marks) 0o la = 1.80 m/s2