Q. If no external voltage is applied across $P$-$N$ junction, there would be
A) No electric field across the junction
B) An electric field pointing from $N$-type to $P$-type side across the junction
C) An electric field pointing from $P$-type to $N$-type side across the junction
D) A temporary electric field during formation of $P$-$N$ junction that would subsequently disappear
Explanation
(b) Across the $P - N$ junction, a barrier potential is developed whose direction is from $N$ region to $P$ region
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.