What is the output voltage of an operational amplifier if the input voltages are Vi1 = 150 μV and Vi2 = 140 μV, given that the amplifier has a differential gain Ad = 4000 and a Common Mode Rejection Ratio (CMRR) of 100?

In a circuit with two identical series-connected NMOS transistors where the top transistor has its gate connected to a 20 V supply and drain connected to a 20 V supply, and both have a threshold voltage of 2 V, neglecting channel length modulation and body effect, what is the output voltage Vout at the source of the top NMOS?

An ideal shunt Zener voltage regulator provides a regulated output of 5.7 V. Determine the required value of the load resistance if the load current is 1 mA, assuming that the Zener diode operates in its stable breakdown region.