In the following, which one of the diodes is reverse biased?
(A)(see structure)✓ Correct
(B)(see structure)
(C)(see structure)
(D)(see structure)
Answer: (A)
Solution
A junction diode is reverse biased when its p-side (anode) is held at a lower potential than its n-side (cathode): the applied voltage then widens the depletion layer and the diode does not conduct. Looking across the four circuits, the reverse-biased diode is the one whose anode is tied to the lower-potential (more negative) terminal, so that forward conduction is blocked.
JEE Main · 2006 · 30 Apr 2006 · Offline · Single correct option
