Analog Electronics
The input offset electric current is usually

  less than the input offset voltage.
  unimportant when a base resistor is used.
  less than the input bias current.
  equal to zero.

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Analog Electronics
In an OP-amp differentiator

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

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