Analog Electronics
The voltage gain of a loaded differential amp is

  impossible to determine.
  large than the unloaded voltage gain.
  equal to RC / re.
  smaller than the unloaded voltage gain.

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Analog Electronics
Pinch-off voltage in a JFET is

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

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