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Question

An oil drop has 7.99 × 1019 C charge. The number of electrons that the oil drop has is .

A
2
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B
5
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C
3
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Solution

The correct option is B 5

Just recall Millikan oil drop experiment.

From that, we can say

Charge on the electron = 1.6 × 1019C

Total charge on the oil drop = 7.99 × 1019C

If there are no electrons on oil drop, there should be no charge.

Hence, the number of electrons = 7.99×10191.6×1019 = 5

Therefore there are 5 electrons on the oil drop.


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