Analog Electronics
The β of a transistor may be determined directly from the curve plotted between

  VBE and IE for constant VCE.
  VCE and IC for constant IB.
  VCE and IC for constant IE.
  VCE and IE for constant IB.

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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 input
Polarity of input and output is the same
The amplitude of output is proportional to rate of change of input

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