Analog Electronics
The input offset electric current is usually

  less than the input bias current.
  less than the input offset voltage.
  unimportant when a base resistor is used.
  equal to zero.

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Analog Electronics
Pinch-off voltage in a JFET is

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

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