Tejas posted an Question
December 16, 2019 • 21:40 pm 15 points
  • IIT JAM
  • Physics (PH)

USP 14 Section A - MCQ Question 18. Can you please tell why Vbe is not used here to find Ib?

USP 14 Section A - MCQ Question 18. Can you please tell why Vbe is not used here to find Ib? Isn't the formula (Vbb-Vbe)/Rb ?  Here only Vbb/Rb is done. Why?

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    Paltu Sen best-answer

    You are right ..To get exact value of Ib we should use Vbe. But if assume the base emitter junction as an ideal one we can set Vbe=0.Also in the cases where Vbb is large compared Vbe we can neglect it..Since here the options given don't match with exact value ,we should neglect Vbe....But here to get exact answer use (Vbb-Vbe)/Rb

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