Analog Electronics
The base of an npn transistor is thin and

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

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Analog Electronics
When a transistor is connected in common emitter mode, it with have

High input resistance and low output resistance
Low input resistance as well as output resistance
Medium input resistance and high output resistance
Negligible input resistance and high output resistance

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