(Solution) - A circuit shown in Fig 3 53 has resistances R1 20 and -(2025 Original AI-Free Solution)

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A circuit shown in Fig. 3.53 has resistances R1 = 20? and R2 = 30?. At what value of the resistance Rx will the thermal power generated in it be practically independent of small variations of that resistance? The voltage between the points A and B is supposed to be constant in this case.