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AP EAMCET202017 Sep 2020Evening ShiftPhysicsSemiconductorsActual

In a (p ) - (n-p ) transistor working as a common base amplifier, when the current gain is 0.96 and emitter current is (7.2 ~mA ), the base current is

Options

  1. A(0.4 ~mA )
  2. B(0.2 ~mA )
  3. C(0.29 ~mA )
  4. D(0.35 ~mA )

Correct answer

C. (0.29 ~mA )

Step-by-step solution

In common base amplifier for (p-n-p ) transistor, current gain, ( =0.96 ) Emitter current, (I_E=7.2 ~mA ) We know that, ( aligned & & = I_C I_E 0.96= I_C 7.2 & I_C & =0.96 7.2=6.912 ~mA aligned ) ( ) Base current, ( aligned I_B & =I_E-I_C=7.2-6.912 & =0.288 ~mA 0.29 ~mA aligned )

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