Q. Ge and Si diodes start conducting at 0.3 V and 0.7 V respectively. In the following figure if Ge diode connection are reversed, the value of $V_o$ changes by : (assume that the Ge diode has large breakdown voltage)

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Solution:

Initially Ge & Si are both forward biased so current will effectivily pass through Ge diode with a drop of 0.3 V
if "Ge" is revesed then current will flow through "Si" diode hence an effective drop of (0.7 - 0.3) = 0.4 V is observed.

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