Analog Electronics
The voltage gain of a loaded differential amp is

  equal to RC / re.
  smaller than the unloaded voltage gain.
  large than the unloaded voltage gain.
  impossible to determine.

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Analog Electronics
For an NPN transistor in normal bias

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

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