X-ray source Here is a simulation of a famous scientific experiment. Spray the oil by clicking the mister), then adjust the voltage until you can get an oil drop to be suspended motionless between the+ and – electrical plates. oil mister small hole (a) Who performed this experiment? +plate 30 O Niels Bohr O Robert Millikan rm pe 20 JJ, Thompson Emest Rutherford 10 O – plate 0. (b) What was determined from this experiment? voltage: o v O The charge of an electron. O The existence of neutrons. O That atoms have a positive nucleus That mass is conserved in chemical reactions.