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The Millikan oil drop experiment of 1909 allowed Robert A. Millikan to determine the charge of...

The Millikan oil drop experiment of 1909 allowed Robert A. Millikan to determine the charge of an electron. In the experiment, an oil drop is suspended between two charged plates by an electric force that equals the gravitational force acting on the 2.07 x 10-14 kg drop.

a) What is the gravitational force on this oil drop?

b) What is the Electric force on the charge?

c) What is the charge on the drop if the electric field is 1.72 x 105 N/C?

d) How many electrons does this make up?

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