Analog Electronics
A common - mode signal is applied to

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

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Analog Electronics
For transistor action

  the base region must be very thin and lightly doped.
  the emitter should be heavily doped.
  all of these.
  Je must be forward biased and Jc should be reverse biased.

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