Analog Electronics
The emitter electric current in a junction with normal bias

  changes greatly by a small changes in collector bias voltage.
  is equal to ICBO.
  is equal to the sum of IB and IC.
  is almost equal to the base current.

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Analog Electronics
Why is silicon preferred than germanium ?

 Silicon has higher tolerance to temperature
 Current sensitivity of silicon with temperature is less
 All the above
 Leakage current due to minority charge carrier is less in silicon

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