Question

Two identical p-n junction 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 are equal in

• A. circuit 1 and circuit 2
• B. circuit 2 and circuit 3
• C. circuit 3 and circuit 1
• D. circuit 1 only

Answer 1

The correct option is B circuit 2 and circuit 3

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 p-n junction. In circuit 2, each p-n junction is reverse biased; same leakage current will flow, giving equal potential difference across each p-n junction diode.