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MHT CET202520 Apr 2025Evening ShiftPhysicsSemiconductorsActual

In an n-p-n transistor amplifier, the collector current is 9 mA . If 90 % of the electrons emitted reach the collector, then

Options

  1. A=9, =0.9
  2. B=0.9, =90
  3. C=0.9, =9
  4. D=90, =0.9

Correct answer

C. =0.9, =9

Step-by-step solution

The ratio of collector current to emitter current is = I_C / I_E . Given that 90 % of emitter current reaches the collector, I_C = 0.9 I_E , so = 0.9 . The current gain relates to as = 1 - . Substituting = 0.9 yields = 0.9 1 - 0.9 = 0.9 0.1 = 9 . The correct option is = 0.9 , = 9 . Answer: C

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