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AP EAMCET201921 Apr 2019Evening ShiftPhysicsSemiconductorsActual

In the following common emitter circuit, β = 100 and V CE = 7 V . If V BE is negligible, then the base current is

Options

  1. A0 . 01   mA
  2. B0 . 04   mA
  3. C0 . 02   mA
  4. D0 . 03   mA

Correct answer

B. 0 . 04   mA

Step-by-step solution

The figure below represents the common emitter circuit, Apply Kirchhoff law, - 15 + 2 I C + V C E = 0 - 15 + 2 I c + 7 = 0 I C = 4   mA The common emitter gain is, β = I C I B 100 = 4 × 10 - 3 I B I B = 0 . 04   mA

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