72. The series pair of 2 . 0 Ω resistors on the right reduce to R0 =4 . 0 Ω, and the parallel pair of identical 4 . 0 Ω resistors on the left reduce to R0 =2 . 0 Ω. The voltage across R0 must equal that across R0 ;thus ,V 0 =V 0i 0R 0 =i 0R 0i 0 = 1 2i 0
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