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OpenStudy (anonymous):

Inez uses hairspray on her hair each morning before going to school. The spray spreads out before reaching her hair partly because of the electrostatic charge on the hairspray droplets. If two drops of hairspray repel each other with a force of 1.3 mN at a distance of 0.4 mm, what is the charge on each of the equally-charged drops of hairspray?

OpenStudy (anonymous):

F = (9x10^9) q^2/r^2 q in coulombs and r in meters.

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