Q 12-14-002NEETNEET 2026Top questionHard
Three identical p-n junction diodes $D_1$, $D_2$ and $D_3$ are connected across a battery as shown in the figure. If the width of the depletion regions of $D_1$, $D_2$ and $D_3$ are $W_1$, $W_2$ and $W_3$, respectively, then the correct option is :
Answer: (C) $W_3 > W_2 > W_1$
$D_1$ points from the positive terminal side to the negative, so it is forward biased. Forward bias narrows the depletion region.
$D_2$ is in a branch that is open at one end, so no voltage appears across it. It is unbiased and has its natural depletion width.
$D_3$ points the other way, so it is reverse biased. Reverse bias widens the depletion region.
$$W_3 > W_2 > W_1$$
Solution by Sreeraj P, M.Sc Physics