Analog Electronics
A common - mode signal is applied to

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

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Analog Electronics
The arrowhead on the transistor symbol points in the direction of

  electron flow in the emitter region.
  majority carrier flow in the emitter region.
  conventional electric current flow in the emitter region.
  minority carrier flow in the emitter region.

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