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Problem: What is the repulsive force between two pith balls that are 8 cm apart and have equal charges of -30 nC?

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Coulomb's law:

F=kq1q2r2

q1 = q2 = -30 nC(10-9C/1nC) = -30 × 10-9 C

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What is the repulsive force between two pith balls that are 8 cm apart and have equal charges of -30 nC?

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