Analog Electronics
The depletion region with in a pn junction is reduced when the junction has :

 reverse bias.
 all of these.
 zero bias.
 forward bias.

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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 in phase with ac base voltage
ac collector voltage is 180° out of phase with ac base voltage

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