Analog Electronics
Most of the electrons in the base of an NPN transistor do not recombine because they

 flow out of the base.
  have a long lifetime.
 have a negative charge.
 must flow through the base.

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

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