Analog Electronics
For an NPN transistor in normal bias

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

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Analog Electronics
The typical input stage of an opamp has a

  single - ended input and single-ended output.
  differential input and single - ended output.
  differential input and differential output.
  single - ended input and differential output.

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