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The value of Z21 in the circuit shown below?

(a) 0

(b) 1

(c) 2

(d) 3

I had been asked this question in an interview.

This interesting question is from Open Circuit Impedence(Z) Parameters topic in division Two-Port Networks of Network Theory

Select the correct answer from above options

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1 Answer

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Right answer is (b) 1

Easy explanation: V2 is the voltage across the 4Ω impedance. The current through 4Ω impedance is I1/4. And V2 = (I1/4) x 4 = I1. So, Z21 = 1Ω.