Analog Electronics
Suppose the base resistor is open. The Q point will be

 at the upper end of the load line.
 off the load line.
  at the lower end of the load line.
 in the middle of the load line.

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Analog Electronics
In an OP-amp differentiator

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

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