A two port network is symmetrical if

In figure the effective resistance faced by voltage source is

For a voltage transfer function H(s), realizable by RLC network, the following statements are made

1. H(s) cannot have a pole at s = 0
2. H(s) cannot have a pole at s = ± j4
3. H(s) cannot have a pole at s = ∞
4. H(s) cannot have a pole at s = + 2

Of these statements

If Z(s) is positive real, then where k has only positive real values is also positive real. This hypothesis was first given by

Which of the following graphs in figure correctly represents the variation of capacitive reactance with frequency?