Q.
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
Explanation
(b) 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.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.