question_answer

In an \[2A/s\] transistor:                           [BHU PMT-2002]

A)                  Negative charge moves from collector to base

B)                  Negative charge moves from emitter to  base

C)                  Holes move from base to collector

D)                  Holes move from emitter to base

Correct Answer: B

Solution :

                 Key Idea: Direction of current is taken opposite to direction of motion of electrons.                 A bipolar junction transistor consists of three regions of doped semiconductors. A small current in the center or base region can be     used to control a larger current flowing between the end regions (emitter and collector)                                 Since direction of current is from base to emitter, the negative changes move from emitter to base