Analog Electronics
The load voltage is approximately constant when a zener diode is

  reverse biased.
  unbiased.
  operating in breakdown region.
  forward biased.

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Analog Electronics
In an OP-amp differentiator

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

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