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  4. 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 Vo changes by: (assume that the Ge diode has large breakdown voltage)

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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)Physics Question Image

JEE MainJEE Main 2019Semiconductor Electronics: Materials Devices and Simple Circuits

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.