Question:
In a transistor, comparing the doping of emitter, base and collector, the part which is heavily doped and that which is lightly doped are respectively
In a transistor, comparing the doping of emitter, base and collector, the part which is heavily doped and that which is lightly doped are respectively
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The emitter must supply many carriers, so it is heavily doped, and the base is thin and lightly doped.
Updated On: Oct 1, 2026
- collector and emitter
- emitter and base
- collector and base
- emitter and collector
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The Correct Option is B
Solution and Explanation
Step 1: Understand the concept
A transistor has three regions: the emitter, the base and the collector. Each has a different doping level to suit its role.
Step 2: Emitter
The emitter emits (injects) a large number of charge carriers into the base, so it is heavily doped.
Step 3: Base
The base is thin and lightly doped, so that only a few of the carriers combine in it and most pass on to the collector.
Step 4: Result
The collector is moderately doped and larger in size, to collect the carriers and dissipate heat. The heavily doped part is the emitter and the lightly doped part is the base, option (B).
Final Answer:
The emitter is heavily doped and the base is lightly doped. This is option (B). \[ \boxed{\text{(B) }\text{Emitter and base}} \]
A transistor has three regions: the emitter, the base and the collector. Each has a different doping level to suit its role.
Step 2: Emitter
The emitter emits (injects) a large number of charge carriers into the base, so it is heavily doped.
Step 3: Base
The base is thin and lightly doped, so that only a few of the carriers combine in it and most pass on to the collector.
Step 4: Result
The collector is moderately doped and larger in size, to collect the carriers and dissipate heat. The heavily doped part is the emitter and the lightly doped part is the base, option (B).
Final Answer:
The emitter is heavily doped and the base is lightly doped. This is option (B). \[ \boxed{\text{(B) }\text{Emitter and base}} \]
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