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 values are possible charges of those oil droplets? − 8.0 × 10 − 19 C − 3.2 × 10 − 19 C − 1.2 × 10 − 19 C − 5.6 × 10 − 19 C − 4.8 × 10 − 19 C − 9.4 × 10 − 19 C

Explanation:

Charge of an Electron

Since Robert Millikan determined the charge of a single electron is

Every possible charged particle must have a charge that is an exact multiple of that elemental charge. For example, if a particle has 5 electrons in excess, thus its charge is

Let's test the possible charges listed in the question:

. We have just found it's a possible charge of a particle

. Since 3.2 is an exact multiple of 1.6, this is also a possible charge of the oil droplets

this is not a possible charge for an oil droplet since it's smaller than the charge of the electron, the smallest unit of charge

cannot be a possible charge for an oil droplet because they are not exact multiples of 1.6

Finally, the charge is four times the charge of the electron, so it is a possible value for the charge of an oil droplet

Summarizing, the following are the possible values for the charge of an oil droplet:

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