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  4. Two identical P-N junctions may be connected in series with a battery in three ways as shown in the adjoining figure. The potential drop across the P-N junctions (in each circuit) are equal in <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/physics/4a2fd657f23cff70fd721c75fe07a62e-.png />

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Q. Two identical $P-N$ junctions may be connected in series with a battery in three ways as shown in the adjoining figure. The potential drop across the $P-N$ junctions (in each circuit) are equal in
image

Semiconductor Electronics: Materials Devices and Simple Circuits

Solution:

In circuit $1, N$ is connected with $N$, which is not a series combination of $P-N$ junction. In circuit 2 , each $P-N$ junction is forward biased, hence same current flows, giving same potential difference across each $P-N$ junction. In circuit 3, each $P_{-} N$ junction is reverse biased, same leakage current will flow, giving equal potential difference across each $P-N$ junction diode.