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Find the Y – parameter Y21 in the circuit shown below.

(a) -1/4

(b) 1/4

(c) 1/2

(d) -1/2

This question was posed to me during an interview.

My question is taken from Short Circuit Admittance(Y) Parameters topic in portion Two-Port Networks of Network Theory

Select the correct answer from above options

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The correct option is (a) -1/4

The explanation is: After short circuiting b-b’, the equation will be -I2=I1 × 2/4=I1/2 and -I2 = V1/4 and on solving and substituting we get Y21 = I2/V1=-1/4 mho.

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