You hold a ruler that has a charge on its tip $2\mathrm{.}60cm$ above a small piece of tissue paper to see if it can be picked up$.$ The ruler has $-12\mathrm{.}0C$ of charge. The tissue paper has $5\mathrm{.}00g$ of mass. What is the minimum charge required to pick up the tissue paper?

What forces act on the tissue paper? How does Newton's second law apply to the forces? Which force can be related to the charges? $C$

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