8–56 The circuit in Figure P8–56 is operating in the sinusoidal steady state. When ZL = 0, the phasor current at the interface is I = 4:8 – j3:6 mA. When ZL = – j20 kΩ, the phasor interface current is I = 10 + j0 mA. Find the Thévenin equivalent of the source circuit.

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Source V ZL FIGURE P8-56