112CHAPTER 18 18.15(a) Connect two 5to get 0-resistors in parallelΩ25 Ω. Then connect that parallel combination in series with a 20-resistorΩfor a total resistance of . 45 Ω(b) Connect two 5to get 25 0-resistors in parallelΩΩ. Also, connect two 20-resistors in parallelΩto get 10 Ω. Then, connect these two parallel combinations in seriesto obtain . 35 Ω18.16 Going counterclockwise around the upper loop, applying Kirchhoff’s loop rule, gives
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