Nessa figura tem-se: R1= 4,0Ω, R2=15Ω, R3=10Ω; e a corrente que passa por R2 é de 2,0A. A diferença de potencial entre os pontos A e B é de: (A) 10V;
(B) 20V;
(C) 30V;
(D) 40V;
(E) 50V.
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