Analog Electronics
If the emitter resistance decreases, the

 Q point stays where it is.
 collector current decreases.
  Q point moves up.
 current gain increases.

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Analog Electronics
In an OP-amp differentiator

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

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