Prob 6-13 Fig 6-56a, b solved

Prob 6-13 Fig 6-56a, b solved - Prob613,Fig656a,b

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Prob 6-13, Fig 6-56a, b Determine the value of the unknown  resistance Using G: 1/Rt = 1/50 + 1/R + 1/90 1/30 = 1/50 + 1/R + 1/90 1/R = 1/30 - 1/50 - 1/90 1/R = 2.22E-3 R  = 1/2.22E-3 =  450  Doing in k : using product/sum Rt = 500 || R; Rt = 500*R/(500 + R) 400 = 500*R/(500 + R) 400(500 + R) = 500*R
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