Analog Electronics
In a JFET, if the gate voltage Vgs is made more negative, then

  depletion region decreases.
  channel electric current increases .
  channel conductivity increases.
  channel conductivity decreases.

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Analog Electronics
Pinch-off voltage in a JFET is

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

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