You break a piece of Styrofoam packing material, and it releases lots of little spheres whose electric
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You break a piece of Styrofoam packing material, and it releases lots of little spheres whose electric charge makes them stick annoyingly to you. If two of the spheres carry equal charges and repel with a force of 21 mN when they’re 15 mm apart, what’s the magnitude of the charge on each?
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