*18. Find the Thévenin equivalent circuit for the portion of the network of Fig. 122 external to the elements between points a and b. 1 = 0.6A290° R₁3 Xc R₂ Hm 10 Ω 1₂₁₂ = 0.8 260° da O ob FIG. 122 Problem 18. 90 10 Ω E = 20 V/40°
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