Analog Electronics
The base - emitter voltage is usually

 equal to the base supply voltage.
 none of these.
 more than the base supply voltage.
  less than the base supply voltage.

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Analog Electronics
In an OP-amp differentiator

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

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