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Working on the Millikan Oil Drop experiment: when working on the lab one of the key...

Working on the Millikan Oil Drop experiment:
when working on the lab one of the key challanges was to select proper oil drops. If the oil drops are too large, their uniform falling speeds will be too fast, resulting in more charges carried by these large oil drops resulting in decreased measurement accuracy. QUESTION: why is it the case that the accuracy decreases?
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