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

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

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Analog Electronics
The common-source JFET amplifier has

  a very high input impedance and a relatively low voltage
  a high input impedance and a very high voltage gain.
  no voltage gain.
  a high input impedance and a voltage gain less than 1.

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