Analog Electronics
A common - mode signal is applied to

  the top of the tail resistor.
  the inverting input.
  the non - inverting input.
  both inputs.

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Analog Electronics
When a transistor is connected in common emitter mode, it with have

Medium input resistance and high output resistance
Low input resistance as well as output resistance
High input resistance and low output resistance
Negligible input resistance and high output resistance

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