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

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

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Analog Electronics
The typical input stage of an opamp has a

  single - ended input and single-ended output.
  differential input and single - ended output.
  differential input and differential output.
  single - ended input and differential output.

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