Analog Electronics
The common - mode rejection ratio is

  as high as possible.
  very low.
  equal to the voltage gain.
  equal to the common-mode voltage gain.

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Analog Electronics
In an OP-amp differentiator

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
The amplitude of output is proportional to input

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