Analog Electronics
An amplifier without feedback has a voltage gain of 50,input resistance os 1 KΩ & Output resistance of 2.5KΩ.The input resistance of the current shunt negative feedback amplifier using the above amplifier with a feedbacik factor of 0.2 is

5KΩ
1/5KΩ
11KΩ
1/11KΩ

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Analog Electronics
For an NPN transistor in normal bias

  the emitter junction has high resistance.
  only majority carriers cross the collector junction.
  only holes cross the collector junction.
  Je is forward biased and Jc is reverse biased.

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Analog Electronics
In an OP-amp differentiator

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
Output occurs when input is finite and constant

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