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## Homework Statement

A person scuffing her feet on a wool rug on a dry day accumulates a net charge of -73 µC. How many excess electrons does this person get?

## Homework Equations

so i did 73x10^-6 / 1.602x10^19 and i got 4.5x10^14

but one of the questions is By how much does her mass increase?

## The Attempt at a Solution

I have no idea how i would go about and in finding this.