Analog Electronics
The most commonly used amplifier in sample & hold circuits is

An inverting amplifier with a gain of 10
A unity gain non-inverting amplifier
An inverting amplifiers with a gain of 100
A unity gain inverting amplifier

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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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