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

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

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Analog Electronics
In all base driver amplifiers

None of these
ac collector voltage is 180° out of phase with ac base voltage
ac collector voltage is in phase with ac base voltage
ac emitter voltage is 180° out of phase with ac base voltage

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