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

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

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Analog Electronics
For transistor action

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

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