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In determining short circuit impedance parameters, among V1, V2, I1, I2, which of the following are independent variables?

(a) I1 and V2

(b) V1 and I2

(c) I1 and I2

(d) V1 and V2

I got this question in an international level competition.

I need to ask this question from Short Circuit Admittance(Y) Parameters topic in chapter Two-Port Networks of Network Theory

Select the correct answer from above options

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The correct option is (d) V1 and V2

The best I can explain: In determining short circuit impedance parameters, among V1, V2, I1, I2; V1 and V2 are independent variables and I1, I2 are dependent variables. Independent variables are the variables that do not depend on any other variable.
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