When an object such as a plastic comb is charged by rubbing it with a cloth, the

Question

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 chare if 3.0 microcoulombs, by what percentage does the mass of a 35-g comb change. My attempt: 1.) Q(total charge)/q (charge of electron) = number of electrons => 3.0*10^-6 (conversion from micro to C)/1.6*10^-19 = 1.875 *10^13 2.) # of electrons * mass of electron (in Kg) 1.875*10^13 * 9.11 * 10^-31 kg = 1.708 * 10^-17 (total mass transferred to comb) 3.) Percentage change: Change/Original 1.708*10^-17/0.035 (conversion of mass in g to kg) = 4.9 *10^-16 Solution in book says its 4.9 *10^-14... where did I go wrong???

Explanation / Answer

4.9 X 10-16 X 100 % = 4.9 X 10-14 %

You did it right . Just express as percentage

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