(a) Draw an ENH mode NMOS (enhancement nMOSFET) and a DEP mode NMOS (depletion nMOSFET) respectively. Please explain what are the differences of

(b) Figure 4.b shows the circuit for determine the 741 op-amp output resistance when vo is positive and is conducting most of the current. Using the resistance of the network calculated in 4.(a) and neglecting the large output resistance of, find Ro when is sourcing an output current of 5mA. (10%,10%)