Analog Electronics
For transistor action

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

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Analog Electronics
In all base driver amplifiers

ac emitter voltage is 180° out of phase with ac base voltage
None of these
ac collector voltage is 180° out of phase with ac base voltage
ac collector voltage is in phase with ac base voltage

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