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Homework Statement
When an object such as a plastic comb is charged by rubbing it with a cloth, the net charge is typically a few microcoulombs.
If that charge is 3.6*10^-6 C, by what percentage does the mass of a 39g comb change during charging?
Homework Equations
n/a?
The Attempt at a Solution
Ok here it goes...
total charge/electron charge=number of electrons
3.6*10^-6 / 1.60*10^-19 =2.47*10^13 Electrons
number of electrons* mass of electron at rest= change in mass
2.47*10^13 * 9.11*10^-31=2.05*10^-17g
change in mass/mass of comb= %change
2.05*10^-17 / .39 = 5.25*10^-17%
It says this is wrong, but I don't know of any other way to work this problem.