The Z-parameters of the two-port network N in Fig. 13-22 (a) are Z₁₁ = 4s, Z₁₂ = Z₂₁ = 3s, and Z₂₂ = 9s. Find the input current i₁ for v_s = cos 1000t (V) by using the open circuit impedance terminal characteristic equations of N, together with KCL equations at nodes A, B, and C.

Data from figure 13-22

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N www (a) C σκο B www * 12 ΚΩ