Analog Electronics
The expression for frequency of oscillations of a RC phase shift oscillator is

None of these
 f = 1 / (2π√R(C1 + C2))
 f = 1 / (2π RC√6)
 f = 1 / (2π√RC)

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Analog Electronics
The common-source JFET amplifier has

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

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