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

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

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Analog Electronics
Voltage Series (feedback also called series-shunt feedback) results in

Increase in input impedance & decreases in output impedance
Decrease in input impedance & increase in output impedance
Increase in both input & output impedances
Decreases in both input & output impedances

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