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1e = 1.6 x10^-19C = 1.6 x10^-13μC
has 0.12 μC of charge per centimeter
pull out 1 cm tape transfer 0.12/(1.6 x10^-13) = 7.5 x10^11 electron to the remain tape.
so the length is
1.6 x10^13/(7.5x10^11) cm = 21.3 cm
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