Multiple choice

A negative resistance Rneg is connected to a passive network N having driving point impedance Z2 (s) as shown below. For Z1 (s) to be positive real,

  1. |Rneg| $\le$ Re Z1 (j$\omega$), $\forall \omega$
  2. |Rneg| $\le$ | Z1 (j$\omega$), $\forall \omega$
  3. |Rneg| $\le$ | ImZ1 (j$\omega$), $\forall \omega$
  4. |Rneg| $\le$ $\angle$ Z1 (j$\omega$), $\forall \omega$
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