The Thevenin equivalent at terminals a-b of the linear network shown in Fig. 4.142 is to be determined by measurement. When a 10-k? resistor is connected to terminals a-b, the voltage Vab is measured as 20 V. When a 30-k? resistor is connected to the terminals, Vab is measured as 40 V. Determine: (a) the Thevenin equivalent at terminals a-b, (b) Vab when a 20-k? resistor is connected to terminals a-b.


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