How much negative charge has been removed from a positively charged electroscope if it has a charge of 7.5x10-11C?

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Q: How much negative charge has been removed from a positively charged electroscope if it has a charge of 7.5x10-11C?

Ans: Quantization rule of charges we know:

q=ne
n=q/e

by putting values

n=7.5 × 10-11/1.6 × 10-19
   =4.69 ×  108

4.69 ×  108   charges have been removed.

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