Analog Electronics
For transistor action

  the emitter should be heavily doped.
  the base region must be very thin and lightly doped.
  all of these.
  Je must be forward biased and Jc should be reverse biased.

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

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

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