The Z parameters Z11, Z12, Z21 and Z22 for the circuit as shown in figure, respectively, are

The Z parameters Z11, Z12, Z21 and Z22 for the circuit as shown in figure, respectively, are Correct Answer 12 Ω, 4 Ω, 4 Ω and 6 Ω

Concept:

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V₁ = (Z₁ + Z₂) I₁ + Z₂I₂

V₂ = Z₂I₁ + (Z₂ + Z₃) I₂

Z₁₁ = Z₁ + Z₂

Z₁₂ = Z₂₁ = Z₂

Z₂₂ = Z₃ + Z₂

Calculation:

Given circuit is a T-circuit. For a T-circuit following trick can be applied

Z₁ = 8, Z₂ = 4, Z₃ = 2

Z₁₁ = 8 + 4 = 12

Z₁₂  = Z₂₁ = 4

Z₂₂ = 4 + 2 = 6.