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JEE Main202118 Mar 2021Evening ShiftPhysicsSemiconductorsActual

The correct relation between α (ratio of collector current to emitter current) and β (ratio of collector current to base current) of a transistor is :

Options

  1. Aβ = α 1 + α
  2. Bα = β 1 - α
  3. Cβ = 1 1 - α
  4. Dα = β 1 + β

Correct answer

D. α = β 1 + β

Step-by-step solution

α = I C I E , β = I C I B I E = I B + I C α = I C I B + I C = 1 I B I C + 1 α = 1 1 β + 1 α = β 1 + β

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