Given below are two statements:
Statement I: In a typical transistor, all three regions emitter, base and collector have same doping level.
Statement II: In a transistor, collector is the thickest and base is the thinnest segment.
In the light of the above statements, choose the most appropriate answer from the options given below.
Statement I: In a typical transistor, all three regions emitter, base and collector have same doping level.
Statement II: In a transistor, collector is the thickest and base is the thinnest segment.
In the light of the above statements, choose the most appropriate answer from the options given below.
- (A)Both Statement I and Statement II are correct
- (B)Both Statement I and Statement II are incorrect
- (C)Statement I is incorrect but Statement II is correct✓ Correct
- (D)Statement I is correct but Statement II is incorrect
Answer: (C)
Solution
In a working transistor the three regions are doped to very different levels, the emitter heavily, the base very lightly, and the collector moderately, so the claim that all three share the same doping is wrong. The description of the geometry, however, is right: the collector is made the largest region so that it can dissipate the heat produced, while the base is kept very thin so that most injected carriers cross it to reach the collector. The first statement is therefore incorrect and the second correct.
JEE Main · 2023 · 31 Jan 2023 · Shift 2 · Single correct option