Analog Electronics
For an NPN transistor in normal bias

  only holes cross the collector junction.
  Je is forward biased and Jc is reverse biased.
  the emitter junction has high resistance.
  only majority carriers cross the collector junction.

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Analog Electronics
In all base driver amplifiers

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

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