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Question: Answered & Verified by Expert
Assertion : In a transistor the base is made thin.
Reason : A thin base makes the transistor stable.
PhysicsSemiconductorsAIIMSAIIMS 2004
Options:
  • A If both assertion and reason are true and reason is the correct explanation of assertion
  • B If both assertion and reason are true but reason is not the correct explanation of assertion
  • C If assertion is true but reason is false
  • D If both assertion and reason are false.
Solution:
2200 Upvotes Verified Answer
The correct answer is: If assertion is true but reason is false
The base is lightly doped and very thin, this constructional feature is key of transistor action due to which only few holes (less than 5\%) are able to combine with the electron in base region. Most of the holes coming form the emitter are able to diffuse through the base region to the collector region.

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