Giancoli 7th Edition textbook cover
Giancoli's Physics: Principles with Applications, 7th Edition
16
Electric Charge and Electric Field
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16-5 and 16-6: Coulomb's Law
16-7 and 16-8: Electric Field, Field Lines
16-10: DNA
16-12: Gauss's Law

Question by Giancoli, Douglas C., Physics: Principles with Applications, 7th Ed., ©2014, Reprinted by permission of Pearson Education Inc., New York.
Problem 8
Q

A person scuffing her feet on a wool rug on a dry day accumulates a net charge of 28  μC-28 \; \mu \textrm{C}. How many excess electrons does she get, and by how much does her mass increase?

A
1.7×1014 electrons, 1.6×1016 kg1.7 \times 10^{14} \textrm{ electrons, } 1.6 \times 10^{-16} \textrm{ kg}
Giancoli 7th Edition, Chapter 16, Problem 8 solution video poster
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VIDEO TRANSCRIPT

This is Giancoli Answers with Mr. Dychko. The number of electrons accumulated by a person when scuffing their feet on a wool rug on a dry day is is one electron for every 1.602 times ten to the minus 19 coulombs times the 28 micro Coulombs they accumulated and the prefix micro means multiply by ten to the minus six. And this works out to 1.7 times ten to the 14 electrons and the change in mass of the person will be this many electrons multiplied by the mass per electron of 9.11 times ten to the minus 31 kilograms per electron. And this gives 1.6 times ten to the minus sixteen kilograms of mass accumulated by this person which is immeasurably small.

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