Analog Electronics
When a reverse bias is applied to gate of JFET the depletion region width

  is uniform in the channel.
None of these
  is wider near the drain and tapers near source.
  is wider near the source and tapers near the drain.

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Analog Electronics
In an OP-amp differentiator

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

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