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For transistor action:

For transistor action: Correct Answer the base region must be narrow

Transistor action refers to the amplifying action:

For amplifier action:

  1. An emitter is doped more than a collector
  2. The width of the collector is more
  3. Emitter-base junction is forward biased
  4. Collector-base junction is reversed biased
  5. The base region is kept low to minimise the recombination of carriers injected from the emitter
  6. Base region can be anything n or p depending on the type if it is pnp transistor or npn transistor respectively

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