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NEET2004PhysicsSemiconductorsActual

Assertion : In a transistor the base is made thin. Reason : A thin base makes the transistor stable.

Options

  1. AIf both assertion and reason are true and reason is the correct explanation of assertion
  2. BIf both assertion and reason are true but reason is not the correct explanation of assertion
  3. CIf assertion is true but reason is false
  4. DIf both assertion and reason are false.

Correct answer

C. If assertion is true but reason is false

Step-by-step solution

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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