Analog Electronics
The input offset electric current equals the

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

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Analog Electronics
For transistor action

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

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