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Resolução - Halliday - Volume 3 - Eletricidade E Magnetismo - P22 039

Exercícios Resolvidos.

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39. Coulomb’s law gives  k(e/3) |q| · |q| = = F = 4πε0 r2 r2 2 8.99 × 109 N·m2 C2  (1.60 × 10−19 C)2 9(2.6 × 10−15 m)2 = 3.8 N .