Analog Electronics
Asource follower using an FET usually has a voltage gain which is

Greater than +100
About -10
Exactly unity but negative
Slightly less than unity but positive

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Analog Electronics
The ICBO is the electric current that flows when some DC voltage is applied

  in the forward direction to the collector junction with emitter open.
  in the reverse direction to the collector junction with emitter open.
  in the forward direction to the emitter junction with collector open.
  in the reverse direction to the emitter junction with collector open.

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