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You charge up the same two pingpong balls from the previous problem each with 1e-8 Coulombs of NEGATIVE charge by rubbing them on a rubber sheet.

You charge up the same two pingpong balls from the previous problem each with 1e-8 Coulombs of NEGATIVE charge by rubbing them on a rubber sheet. Just as before, you suspend the balls from insulated strings with their centers 3 cm apart. What is the magnitude of the force between them?

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