Analog Electronics
The extremely high input impedance of a MOSFET is primarily due to the

  extremely small leakage electric current of its gate capacitor.
  depletion of electric current carriers.
  negative gate-source voltage.
  absence of its channel.

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Analog Electronics
Conventional biasing of a BJT has

  EB forward biased and CB reversed biased.
  EB reversed biased and CB forward biased.
  EB reversed biased and CB reversed biased.
  EB forward biased and CB forward biased.

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