Analog Electronics
The transition capacitance of a reverse biased pn junction having uniform doping on both sides, varies with junction voltage ( VB ) as

  1 / VB.
  ( VB )2.
  VB.
  ( VB )- 1 / 2.

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Analog Electronics
In an OP-amp differentiator

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

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