Analog Electronics
Most of the electrons in the base of an NPN transistor do not recombine because they

 flow out of the base.
 have a negative charge.
  have a long lifetime.
 must flow through the base.

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

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

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