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

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

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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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Analog Electronics
The arrowhead on the transistor symbol points in the direction of

  conventional electric current flow in the emitter region.
  minority carrier flow in the emitter region.
  majority carrier flow in the emitter region.
  electron flow in the emitter region.

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