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Exercicios Propostos do livro Fisica para Ensino Medio
EP5=Em dois vértices horizontais B e C, de um triângulo equilátero de 3m cm de lado, estão colocadas, respectivamente, as cargas puntiformes Qb=-2mC e Qc=+2mC, imersas no vácuo. Sendo a constante eletrostatica k0=9.10^9 N. M^2/C^2, determine o módulo, a direção e o sentido do vetor campo elétrico resultante no vértice A do triângulo.
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