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Which of the following expression is true in case of open circuit parameters?

(a) V2 = Z21I2 + Z22 I2

(b) V2 = Z21I1 + Z22 I2

(c) V1 = Z21I2 + Z22 I2

(d) V1 = Z21I1 + Z22 I2

This question was addressed to me in unit test.

Origin of the question is Open Circuit Impedence(Z) Parameters in portion Two-Port Networks of Network Theory

Select the correct answer from above options

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The correct choice is (b) V2 = Z21I1 + Z22 I2

The explanation: The expression relating the currents I1, I2 and voltage V1 and open circuit parameters Z21, Z22 is V2 = Z21I1 + Z22 I2.