Analog Electronics
For an NPN transistor in normal bias

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

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

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

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