Analog Electronics
The base of an npn transistor is thin and

 metallic.
  lightly doped.
 heavily doped.
 doped by a pentavalent material.

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Analog Electronics
For transistor action

  all of these.
  Je must be forward biased and Jc should be reverse biased.
  the emitter should be heavily doped.
  the base region must be very thin and lightly doped.

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