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The relation between Z11 and Z12 if the network is symmetrical is?

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The relation between Z11 and Z12 if the network is symmetrical is?

(a) Z11 = 2 Z12

(b) Z11 = Z12

(c) Z11 = 3 Z12

(d) Z11 = 4 Z12

I have been asked this question in class test.

This interesting question is from Image Parameters topic in division Two-Port Networks of Network Theory

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Correct choice is (b) Z11 = Z12

Explanation: For a network to be symmetrical A=D. So the relation between Z11 and Z12 for the network is symmetrical is Z11 = Z12.

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