Analog Electronics
When the source voltage increases in a zener regulator, which of these electric current remain approximately constant ?

  Series current.
  None of these.
  Load current.
  Zener current.

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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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