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The smallest unit of charge is –1.6× 10–19 C, which is the charge (in coulombs) of a single electron. Robert Millikan was able to measure the charge on small droplets of oil by suspending them between a pair of electrically charged plates. Which of the following are possible charges of those oil droplets

Answer :

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From the oil experiment, Millikan found that all drops had charges which were multiples of 1.6 x 10-19 C. From the choices, any number that is a multiple of 1.6× 10–19 would be correct. Hope this answers the question. Have a nice day.

Considering the following choices;

i) -1.2x10^-19C

ii) -3.2x10^-19C

iii ) -4.8x10^-19C

iv ) -5.6x10^-19C

v ) -8.0x10^-19C

vi ) -9.4x10^-19C

Answer;

-Any number that is a multiple of 1.6 is correct, because you can't have a fraction of an electron. This means the correct choices are -3.2x10^-19C, -8.0x10^-19C

and -4.8x10^-19C
.

-The first one is wrong even if it is a multiple of 1.6, because it's charge is smaller than the charge of a single electron, implying that it has a fraction of an electron.

-Hence; -1.2x10^-19, -5.6x10^-19, and -9.4x10^-19 are incorrect since they will have fraction electrons which can not exist.

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