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MHT CET202615 April 2026Evening ShiftPhysicsSemiconductorsActual

In common emitter amplifier, a change of 0.2 mA in the base current causes a change of 5 mA in the collector current. If input resistance is 2 k and voltage gain is 75 , the load resistance used in the circuit is

Options

  1. A2 k
  2. B3 k
  3. C4 k
  4. D6 k

Correct answer

D. 6 k

Step-by-step solution

The current gain in a common emitter amplifier is given by: = I_C I_B Substituting the given values: = 5 mA 0.2 mA = 25 The voltage gain A_v is related to the current gain, load resistance R_L , and input resistance R_ in by the formula: A_v = R_L R_ in Substituting the known values into the equation: 75 = 25 R_L 2 k R_L 2 k = 75 25 = 3 R_L = 3 2 k = 6 k Answer: 6 k

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