ANS:B - depletion region

P-type material has +ve charge carriers (holes) and N-type has -ve (electrons). When they come together they attract each other and some electrons tend to go to p-side whereas some holes tend to go n-side.


As they travel towards junction electrons and holes combine together to neutralize and form ions. Formation of ions makes one narrow charged region on either side of PN junction. This junction is free from movable charge carriers and ions inside it are stationary and maintain a space between them without any charge carriers. This region is called as depletion region.