Two impedances Z1 = - 2 +j 8 ohms and Z2 = 6 - j12 ohms are connected in a circuit so that they are subtractive. Find the resultant impedance. O-8- j4 ohms O 4 + j20 ohms O-8+ j20 ohms O 4- j4 ohms

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Z parameter

The Z-parameters that are the impedance parameters of a two-port network are defined by expressing the two-port voltages V1 and V2 in terms of two-port currents I1 and I2. The Z-parameters are calculated by open circuiting one of the two ports at a time henceforth they are called open-circuit impedance parameters.