(a) The circuit in Figure P8-45 is operating in the sinusoidal steady state. When \(Z_{\mathrm{L}}=\mathrm{o}\), the phasor current at the interface is \(\mathbf{I}=4.8-j 3.6 \mathrm{~mA}\). When \(Z_{\mathrm{L}}=-j 20 \mathrm{k} \Omega\), the phasor interface current is \(\mathbf{I}=\mathbf{1 0}+j 0 \mathrm{~mA}\). Find the Thévenin equivalent of the source circuit.

(b) Design a load so that \(\mathbf{V}_{\mathrm{L}}=274 \angle-71.6^{\circ} \mathrm{V}\).