Analog Electronics
Most of the electrons in the base of an NPN transistor flow

 out of the base lead.
  into the collector.
 into the base supply.
 into the emitter.

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Analog Electronics
In all base driver amplifiers

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

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