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AP EAMCET202120 Aug 2021Evening ShiftPhysicsSemiconductorsActual

A change of 0 . 04 volts takes place between the base and the emitter when an input signal is connected to the common emitter transistor amplifier. As a result, 20 μA change takes place in the base current and a change of 2 mA takes place in the collector current. The input resistance and AC current gain are

Options

  1. A1   kΩ   & 100
  2. B2   kΩ   & 100
  3. C2   kΩ   & 1000
  4. D1   kΩ   &   200

Correct answer

B. 2   kΩ   & 100

Step-by-step solution

Given: ΔI b = 20   μ A ΔI c = 2   mA ΔV BE = 0 . 04   V Input resistance R input   = V BE ΔI b = 0 . 04 20 × 10 - 6 = 2   kΩ A . C . current gain β = ΔI c ΔI b = 2 × 10 - 3 20 × 10 - 6 = 100

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