Analog Electronics
Which is the third region where no charge carriers are present when n-type and p-type are attached together ?

None of these
 Forward region
 Depletion region
 Reversed region

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Analog Electronics
Optocouplers combine

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

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