In Fig. P4.6, and . Draw an approximatelyequivalent circuit for low-medium frequencies. At what frequency does this approximate circuit cease to be valid? Compare the transfer functions, Bode plots,...

In Fig. P4.6, and . Draw an approximatelyequivalent circuit for low-medium frequencies. At what frequency does this approximate circuit cease to be valid? Compare the transfer functions, Bode plots, and step responses of the approximate and exact circuits.