Analog Electronics
The leakage electric current of a pn junction is caused by

  majority carriers.
  heat energy.
  barrier potential.
  chemical energy.

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Analog Electronics
For transistor action

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

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