Analog Electronics
Pinch-off voltage in a JFET is

 the drain voltage that gives infinite drain current.
 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.

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Analog Electronics
In an OP-amp differentiator

The amplitude of output is proportional to rate of change of input
Output occurs when input is finite and constant
Polarity of input and output is the same
The amplitude of output is proportional to input

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