Analog Electronics
The magnitude of electric current ICBO

  depends largely upon emitter-base junction base potential.
  is generally greater in silicon than in germanium transistor.
  depends largely upon the emitter doping.
  increases with the increase in temperature.

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

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

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