Ge and Si diodes conduct at 0.3 V and 0.7 V respectively. In the following figure, if Ge diode connection are reversed, the value of V0 changes by

Consider the case when Ge and Si diodes are connected as shown in the given figure.Equivalent voltage drop across the combination Ge and Si diode = 0.3 V⇒Current, i=12-0.35 kΩ=2.34 mA∴ Output voltage, V0=Ri=5 kΩ×2.34 mA = 11.7 VNow consider the case when diode connection are reversed. In this case voltage drop across the diode's combination =0.7 V⇒Current, i=12-0.75 kΩ=2.26 mA∴ Output voltage, V0=Ri=2.26 mA ×5 kΩ= 11.3 VHence charge in the value of V0 = 11 .7 - 11.3 = 0.4 V