Q. A semiconductor device is connected in a series circuit with a battery and a resistance. A current is found to pass through the circuit. If the polarity of the battery is revered, the current drops almost to zero. The device may be
A) A $p$-type semiconductor
B) An $n$-type semiconductor
C) A $p - n$ junction
D) An intrinsic semiconductor
Explanation
(c) The reverse biasing of $p - n$ junction supports the barrier voltage. Due to which the current through the junction due to majority carriers becomes nearly zero.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.