Analog Electronics
The input offset electric current equals the

 average of the two base currents.
 collector electric current divided by the base current.
 difference between the two base currents.
 difference between the two base-emitter voltages.

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Analog Electronics
For transistor action

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

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