Analog Electronics
The following relationship between α and β are correct except

  β = α / (1 - α).
  α = β / (1 + β).
  1 - α = 1 / (1 + β).
  α = β / (1 - β).

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Analog Electronics
The common-source JFET amplifier has

  no voltage gain.
  a very high input impedance and a relatively low voltage
  a high input impedance and a voltage gain less than 1.
  a high input impedance and a very high voltage gain.

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