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  4. A silicon and germanium diode is connected in series as shown below <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/physics/6a2a19ac7ba884820d615724ebe1f6f0-.png /> The current flowing through the circuit will be

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Q. A silicon and germanium diode is connected in series as shown below
image
The current flowing through the circuit will be

MHT CETMHT CET 2021

Solution:

We know that, barrier potential of $G e, V_{B_1}=0.3 V$ and barrier potential of $S i, V_{B_2}=0.7 V$
Redrawing the above figure as
image
Applying KVL, we get
$ -19+0.3+1 \cdot I+0.7+2 I=0$
$ \Rightarrow 3 I=18 \Rightarrow I=6 A$