Analog Electronics
The diffusion capacitance of a forward biased P+N junction diode with a steady electric current I depends on

  mean life time of the electrons.
  width of the depleted region.
  junction area.
  mean life time of the holes.

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Analog Electronics
Pinch-off voltage in a JFET is

 the drain voltage that gives zero drain current.
 the drain voltage that gives infinite drain current.
 the gate to source voltage that gives unity drain current.
 the gate to source voltage that gives zero drain current.

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