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MHT CET202616 April 2026Morning ShiftPhysicsSemiconductorsActual

In a transistor 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. A4 k
  2. B6 k
  3. C8 k
  4. D2 k

Correct answer

B. 6 k

Step-by-step solution

The AC current gain is given by the ratio of the change in collector current to the change in base current: = I_C I_B Substituting the given values: = 5 mA 0.2 mA = 25 The voltage gain A_v of a transistor amplifier is given by: A_v = R_L R_ in Substituting the known values into the formula: 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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