Analog Electronics
In a normally biased npn transistor, the electrons in the emitter have enough energy to overcome the barrier potential of the

 collector - base junction.
  base - emitter junction.
 base - collector junction.
 recombination path.

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Analog Electronics
In an OP-amp differentiator

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
Polarity of input and output is the same

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