Analog Electronics
The voltage gain of a loaded differential amp is

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

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Analog Electronics
For an NPN transistor in normal bias

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

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