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

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

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Analog Electronics
When a transistor is connected in common emitter mode, it with have

Negligible input resistance and high output resistance
Low input resistance as well as output resistance
Medium input resistance and high output resistance
High input resistance and low output resistance

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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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