Analog Electronics
In the second approximation, the total voltage across the zener diode is the sum of the breakdown voltage and the voltage across the

  source.
  series resistor.
  zener resistance.
  zener diode.

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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 input
The amplitude of output is proportional to rate of change of input

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