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

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

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Analog Electronics
Optocouplers combine

  Infrared light emitting diode and a silicon photo transistor.
 IGBTs and MOSFETs.
 SITs and BJTs.
 Power transistor and silicon transistor.

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