Analog Electronics
In the active region, the collector current is not changed significantly by

 base current.
 current gain.
 base supply voltage.
  collector resistance.

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Analog Electronics
In an OP-amp differentiator

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

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