Analog Electronics
In a JFET, if the gate voltage Vgs is made more negative, then

  channel conductivity increases.
  depletion region decreases.
  channel electric current increases .
  channel conductivity decreases.

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Analog Electronics
In an OP-amp differentiator

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

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