Analog Electronics
In a bipolar junction transistor the base region is made very thin so that

  electric field gradient in base is high.
  base can be easily biased.
  base can be easily fabricated.
  recombination in base region is minimum.

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Analog Electronics
For an NPN transistor in normal bias

  only majority carriers cross the collector junction.
  the emitter junction has high resistance.
  only holes cross the collector junction.
  Je is forward biased and Jc is reverse biased.

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