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From the circuits shown below, find the combined Z-parameter Z12.

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From the circuits shown below, find the combined Z-parameter Z12.

(a) 4

(b) 5

(c) 6

(d) 7

I have been asked this question in final exam.

The above asked question is from Inter Connection of Two-Port Networks topic in section Two-Port Networks of Network Theory

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The correct answer is (d) 7

The explanation is: The Z-parameter Z12 is Z12 = Z12x + Z12y and we have Z12x = 2, Z12y. On substituting we get Z12 = 2 + 5 = 7Ω.

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