Analog Electronics
The voltage follower has a

  large closed - loop output impedance.
  closed - loop bandwidth of zero.
  small open - loop voltage gain.
  closed - loop voltage gain of unity.

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

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

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