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

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

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Analog Electronics
Voltage Series (feedback also called series-shunt feedback) results in

Increase in input impedance & decreases in output impedance
Increase in both input & output impedances
Decreases in both input & output impedances
Decrease in input impedance & increase in output impedance

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Analog Electronics
In a transistor amplifier, the reverse saturation electric current ICO

  double for every 10° rise in temperature.
  double for every 1° rise in temperature.
  double for every 5° rise in temperature.
  increase linearly with the temperature.

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