Which of the following are the conditions for a two port

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Which of the following are the conditions for a two port passive network to be a reciprocal one?
1. Z₁₂ = z₂₁
2. Y₁₂ = y₂₁
3. h₁₂ = – h₂₁
Select the correct condition from the code given below—

1. Only 1 and 2
2. Only 2 and 3
3. Only 1 and 3
4. 1, 2 and 3

Correct Option: D

For the two port passive network to be reciprocal

1.	Z₁₂	=	Z₂₁ →	correct
2.	Y₁₂	=	Y₂₁ →	correct
3.	h₁₂	=	h_-21 →	correct

(D) is the correct choice.