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A 2.5 gram penny is given a charge of -4.0 *10^-9 c. How many excess electrons...

A 2.5 gram penny is given a charge of -4.0 *10^-9 c. How many excess electrons are on the penny?

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Answer #1

Using the quantisation of charge ,Q=ne

4*10^-9=n*1.6*10^-19

n=2.5*10^10 is no. of excess electrons

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