Analog Electronics
N-type extrinsic semiconductor is obtained by adding

 trivalent impurity
 tetravalent impurity
 pentavalent impurity
All of these

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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.
  increases with the increase in temperature.
  depends largely upon the emitter doping.

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