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The y-parameters for the network shown in the figure can be represented by

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ESE Electrical 2017 Official Paper
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Concept:

Y parameter:

I1 = V1 Y11 + V2 Y12

I2 = V1 Y21 + V2 Y22

     ...1)

     ...2)

Calculation:

For the given question Z = 5 Ω

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