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The value of Z21 in the circuit shown below?(a) 0(b) 1(c) 2(d) 3I 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

Answer»

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.



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