Analog Electronics
In a properly biased NPN transistor most of the electrons from the emitter

  pass through the base to the collector.
  are stopped by the junction barrier.
  recombine with holes in the base .
  recombine in the emitter its self.

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Analog Electronics
The typical input stage of an opamp has a

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

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