In the early 1900s, Robert Millikan used small charged dropINT lets ofoil , suspended in
Chapter 21, Problem 72(choose chapter or problem)
In the early 1900s, Robert Millikan used small charged dropINT lets ofoil , suspended in an electric field, to makethe first quantitativemeasurements of the electron 's charge. A 0. 70-11m-diameterdroplet of oil, having a charge of +e, is suspended in midairbetween two horizontal plates of a parallel-plate capacitor. Theupward electric force on the droplet is exactly balanced by thedownward force of gravity. The oil has a density of 860 kglm3,and the capacitor plates are 5.0 mm apart. What must thepotential difference between the plates be to hold the droplet inequil ibrium?
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