Analog Electronics
Asource follower using an FET usually has a voltage gain which is

Slightly less than unity but positive
About -10
Exactly unity but negative
Greater than +100

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Analog Electronics
In all base driver amplifiers

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

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