Analog Electronics
For an NPN transistor in normal bias

  only holes cross the collector junction.
  only majority carriers cross the collector junction.
  Je is forward biased and Jc is reverse biased.
  the emitter junction has high resistance.

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Analog Electronics
In an OP-amp differentiator

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

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