Analog Electronics
In a MOSFET, the polarity of the inversion layer is the same as that of the

  majority carries in the substrate.
  majority carries in the source .
  charge on the gate electrode.
  minority carriers in the drain .

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Analog Electronics
For an NPN transistor in normal bias

  only majority carriers cross the collector junction.
  the emitter junction has high resistance.
  Je is forward biased and Jc is reverse biased.
  only holes cross the collector junction.

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