Analog Electronics
IGFET is a

  3 / 2 power - low device .
  half - power device.
  linear device.
  square - law device.

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Analog Electronics
Pinch-off voltage in a JFET is

 the gate to source voltage that gives unity drain current.
 the drain voltage that gives infinite drain current.
 the gate to source voltage that gives zero drain current.
 the drain voltage that gives zero drain current.

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