Analog Electronics
In a MOSFET, the polarity of the inversion layer is the same as that of the

  majority carries in the substrate.
  charge on the gate electrode.
  minority carriers in the drain .
  majority carries in the source .

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Analog Electronics
The common-source JFET amplifier has

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

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