Q 12-14-205NEETNEET 2022Top questionMedium
In the given circuits (a), (b) and (c), the potential drop across the two $p$-$n$ junctions are equal in
Answer: (A) Both circuits (a) and (c)
In each circuit the two junctions are in series with the cell.
(a) PN and PN face the same way, so both are forward biased or both reverse biased. They are identical and carry the same current, so the drops are equal.
(c) NP and NP also face the same way: equal drops for the same reason.
(b) PN and NP face opposite ways, so one is forward biased (small drop) and the other reverse biased (almost all the cell voltage). The drops are unequal.
Equal in (a) and (c).
Solution by Sreeraj P, M.Sc Physics