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MHT CET202015 Oct 2020Morning ShiftPhysicsSemiconductorsActual

In common emitter mode of transistor, the d.c. current gain is 20 , the emitter current is 7 ~mA . The collector current is

Options

  1. A16 / 3 ~mA
  2. B13 / 3 ~mA
  3. C8 / 3 ~mA
  4. D20 / 3 ~mA

Correct answer

D. 20 / 3 ~mA

Step-by-step solution

= I_ C I_ B =20 I_ C I_ E -I_ C =20 I_ E -I_ C I_ C = 1 20 I_ E I_ C -1= 1 20 I_ E I_ C = 1 20 +1= 21 20 I_ C = 20 21 7= 20 3 ~mA

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