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How do we calculate the inverse hybrid parameter g21 of a two – port network?

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How do we calculate the inverse hybrid parameter g21 of a two – port network?

(a) g21 = I1 / I2

(b) g21 = I2 / I1

(c) g21 = V2 / V1

(d) g21 = V1 / V2

I had been asked this question in an interview for internship.

The query is from Measurement of H-Parameters in division Small-Signal Low-Frequency AC models of Transistors of Electronic Devices & Circuits

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Correct option is (c) g21 = V2 / V1

The explanation is: The inverse hybrid parameter g21 for a two – port network is calculated by open circuiting the output terminal. In this case, the current I2 is equal to zero. The parameter g21 is calculated by taking the ratio of output terminal voltage over input terminal voltage. It is also known as the open circuit voltage gain.

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