Analog Electronics
The current gain of a pnp transistor is

 the negative of the npn current gain.
 near zero.
 the collector current divided by the emitter current.
 the ratio of collector current to emitter current.

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Analog Electronics
The common-source JFET amplifier has

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

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