In a passive two-port network, the open-circuit impedance

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In a passive two-port network, the open-circuit impedance matrix is 10 2
5 2

If input port is interchanged with the output port, then open-circuit impedance matrix will be

1. 10 2
  5 2
2. 5 2
  2 10
3. 5 10
  2 2
4. 2 5
  10 2

Correct Option: B

The port-equations are
V₁ = 10 I ₁ + 2I ₂ ....(i)
V₂ = 2I ₁ + 5 I₂ ....(ii)
Rewriting equations (i) and (ii) as
V₂ = 5 I₂ + 2I₁ ....(iii)
V₁ = 2 I₂ + 10 I₁ ....(iv)
Writing in matrix form

		V₂		=		5			2			I₂
		V₁				2			10			I₁